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Cam selection; 340 with manifolds #2215583
12/17/16 12:56 PM
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dd340 Offline OP
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I have been running a 69 dart 340 for a few years with a racer brown cam 220* .460 lift cam. It works really good but I would like to increase the horsepower. Any recommendations for a small block running stock manifolds? I would consider a solid cam but would prefer hydraulic. I have stock 2.02 valve heads and stock 10.5 compression.
My original idea was to put headers on it but TTI's and full exhaust run close to 2k in Canada so I'm hoping for a better option.
Opinions?

Re: Cam selection; 340 with manifolds [Re: dd340] #2215621
12/17/16 01:44 PM
12/17/16 01:44 PM
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OT have you dialed in the dist spot on? It makes a world of difference. Is the A/F ratio correct? mandrel bends in exhaust & general free flowing? Here's a BTT for ya since you ain't gettin any love on your Q (& I ain't a cam guy).


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Re: Cam selection; 340 with manifolds [Re: dd340] #2215629
12/17/16 01:54 PM
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I don't think you're going to find the magic you're looking for in a cam swap.

Keep saving for the headers and exhaust system.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Cam selection; 340 with manifolds [Re: dd340] #2215655
12/17/16 02:35 PM
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Upgrading parts is interdependant.

Right now you have a very mild cam and the full boat TTI setup will probably not net a substantial difference, certainly not $2000 worth.

Putting in more cam will probably not see as great an improvement with manifolds as it would with headers.

But then again, if the intake system is the bottle neck you need to improve that as well.

Vicious circle.

And as you up the HP potential the cycle only becomes more pronounced. But any one of those changes will show some improvement and as you can afforded upgrading the other areas will enhance that improvement.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Cam selection; 340 with manifolds [Re: dd340] #2215712
12/17/16 03:44 PM
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Back when my 340 had HP manifolds, RPM intake, 650VS carb, 3500 converter, and 3:91's, Scott Brown spec'd me out a cam that was 226/238, 270/288, .489"/.480" on a 112 cl. This has been a great little cam and I still run it today with other upgrades since the cam swap.
But the best single upgrade that I ever made for my stockish 340 was removing the stock convertor for the 3500 unit. (I did not see what tranny you were running, but thought to throw this out there.)


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Cam selection; 340 with manifolds [Re: dd340] #2215730
12/17/16 04:17 PM
12/17/16 04:17 PM
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Spokane Washington
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You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 280, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02

340 Fast Engine Cam.jpg
Re: Cam selection; 340 with manifolds [Re: ScottSmith_Harms] #2215766
12/17/16 05:17 PM
12/17/16 05:17 PM
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Ottawa, ontario
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dd340 Offline OP
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Originally Posted By ScottSmith_Harms
You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 200, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02


Thanks for those dyno numbes Scott. Where did you make peak hp on that stroker motor with manifold? I assume it was pretty low in the rpm band.
Maybe I would be further ahead putting a stroker assembly in it.

Re: Cam selection; 340 with manifolds [Re: RapidRobert] #2215770
12/17/16 05:20 PM
12/17/16 05:20 PM
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dd340 Offline OP
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Originally Posted By RapidRobert
OT have you dialed in the dist spot on? It makes a world of difference. Is the A/F ratio correct? mandrel bends in exhaust & general free flowing? Here's a BTT for ya since you ain't gettin any love on your Q (& I ain't a cam guy).


I'm not at all upset with the way the current set up runs. I have run a best of 13.7 at about 102 mph, that's with 3.23 non suregrip gears. So feel like it's pretty much doing what it should. I just have the motor out of the car right now so I want to upgrade a bit.

Re: Cam selection; 340 with manifolds [Re: dd340] #2215773
12/17/16 05:23 PM
12/17/16 05:23 PM
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dd340 Offline OP
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Originally Posted By dd340
Originally Posted By ScottSmith_Harms
You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 200, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02


Thanks for those dyno numbes Scott. Where did you make peak hp on that stroker motor with manifold? I assume it was pretty low in the rpm band.
Maybe I would be further ahead putting a stroker assembly in it.


By the way, I have a stroker 340 motor in my 87 ram d100 and it's awesome, but with my dart I was just looking for another 30-40 hp.

Re: Cam selection; 340 with manifolds [Re: dd340] #2215776
12/17/16 05:24 PM
12/17/16 05:24 PM
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Quote:
My original idea was to put headers on it but TTI's and full exhaust run close to 2k in Canada so I'm hoping for a better option.


Quote:
Maybe I would be further ahead putting a stroker assembly in it.


Because that's a cheaper option than the headers and exhaust?


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Cam selection; 340 with manifolds [Re: fast68plymouth] #2215777
12/17/16 05:26 PM
12/17/16 05:26 PM
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dd340 Offline OP
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Originally Posted By fast68plymouth
Quote:
Maybe I would be further ahead putting a stroker assembly in it.


Because that's a cheaper option than the headers and exhaust?


No but maybe better bang for the buck. I haven't looked up the cost of stroker assembly's lately.

Re: Cam selection; 340 with manifolds [Re: dd340] #2215835
12/17/16 06:59 PM
12/17/16 06:59 PM
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Spokane Washington
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The strokers make peak torque around 4,200 rpm, but the torque is noticeably stronger from idle to peak and nice and flat afterwards. Its like driving a (strong) big block. On the street torque is king as you don't need to rev the engine to the moon to make big power.

If you are considering a complete build definitely put your money into a stroker it and if you want more later it's easy to add or change external stuff. Stroker kits are getting really reasonable now, 4.00" cast cranks are only $299.00, but I'd step up to a good forged crank if affordable. As for brands, I like Scat or Callies, but even an Eagle is ok.

Re: Cam selection; 340 with manifolds [Re: ScottSmith_Harms] #2216075
12/18/16 04:42 AM
12/18/16 04:42 AM
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Originally Posted By ScottSmith_Harms
You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 200, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02


Could you elaborate on the heads used on each motor respectively?

Re: Cam selection; 340 with manifolds [Re: dd340] #2216153
12/18/16 12:43 PM
12/18/16 12:43 PM
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Very interested combo Scott, are the manifolds flowed in anyway? Exhaust or intake? I have to figure your carbs work like no other as well.


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Re: Cam selection; 340 with manifolds [Re: dd340] #2216168
12/18/16 12:59 PM
12/18/16 12:59 PM
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(I corrected my first post typo on flow numbers).The heads on the 422 are econo W2's ported by Moparts member OU812, they flowed in the 285-290 range. I can't elaborate on the 426 heads but they flowed in the 275 range. Both have 1.5 rockers (although 1.6's might offer up a bit more power). The 426's exhaust manifolds have been extrude honed but on the dyno we tested them vs unmodified examples and there was only a couple HP difference. The intake is bone stock as is the Thermo-quad (4972) didn't even change the jets so nothing magical there. I'm sure some jet changing and intake porting would find more power.

Re: Cam selection; 340 with manifolds [Re: ScottSmith_Harms] #2216274
12/18/16 03:30 PM
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DD340 those numbers with a non sure grip are pretty darn good. It would be interesting with 3.91s and tuning.

Re: Cam selection; 340 with manifolds [Re: joes68340s] #2216288
12/18/16 03:52 PM
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Originally Posted By joes68340s
DD340 those numbers with a non sure grip are pretty darn good. It would be interesting with 3.91s and tuning.


Running 13.7's with 3.23 open with that cam, and stock manifolds sound pretty well tuned already

Re: Cam selection; 340 with manifolds [Re: autoxcuda] #2216305
12/18/16 04:12 PM
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Originally Posted By autoxcuda
Originally Posted By joes68340s
DD340 those numbers with a non sure grip are pretty darn good. It would be interesting with 3.91s and tuning.


Running 13.7's with 3.23 open with that cam, and stock manifolds sound pretty well tuned already

I think it it would really benefit from a decent converter, sure grip and some sticky tires. I think it could be a low 13 sec car. My best 60' time is around 2.15 sec.

Re: Cam selection; 340 with manifolds [Re: dd340] #2216522
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When I say tuning I'm talking the entire package chassis is huge now. Hes got great mph.

Re: Cam selection; 340 with manifolds [Re: dd340] #2216528
12/18/16 09:14 PM
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Originally Posted By dd340
I have been running a 69 dart 340 for a few years with a racer brown cam 220* .460 lift cam. It works really good but I would like to increase the horsepower. Any recommendations for a small block running stock manifolds? I would consider a solid cam but would prefer hydraulic. I have stock 2.02 valve heads and stock 10.5 compression.
My original idea was to put headers on it but TTI's and full exhaust run close to 2k in Canada so I'm hoping for a better option.
Opinions?


Based on your opening question and some of your responses I think we need to know your budget, and your expectation. Certainly you can put headers on the car for far less than $2000. I also think that that a different cam will put more power in it too.

Your car/motor seems to run about right for what it is, and making any one change will not likely yield a huge gain.

Are you running your current combo on pump gas? If so, this surprises me. What is you cranking cylinder pressure?

If you go to a cam swap, I would go with a small solid

Last edited by BSB67; 12/18/16 09:22 PM.
Re: Cam selection; 340 with manifolds [Re: BSB67] #2216666
12/18/16 10:58 PM
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Originally Posted By BSB67
Originally Posted By dd340
I have been running a 69 dart 340 for a few years with a racer brown cam 220* .460 lift cam. It works really good but I would like to increase the horsepower. Any recommendations for a small block running stock manifolds? I would consider a solid cam but would prefer hydraulic. I have stock 2.02 valve heads and stock 10.5 compression.
My original idea was to put headers on it but TTI's and full exhaust run close to 2k in Canada so I'm hoping for a better option.
Opinions?


Based on your opening question and some of your responses I think we need to know your budget, and your expectation. Certainly you can put headers on the car for far less than $2000. I also think that that a different cam will put more power in it too.

Your car/motor seems to run about right for what it is, and making any one change will not likely yield a huge gain.

Are you running your current combo on pump gas? If so, this surprises me. What is you cranking cylinder pressure?

If you go to a cam swap, I would go with a small solid


Currently yes I only use pump gas but it tends to knock on 91 octane so I pretty much only run it on 94 which I have easy access to.
If I go the headers route I will also swap the cam since I think it makes sense to maximize the benefits of it.
It's not so much a budget issue as much as cost per benefit, 2k just seems like a lot for an exhaust swap. The exhaust I have now is all original so I kind of like it as is. My hope was to gain 30hp without switching out my current exhaust but that may be unrealistic.

Re: Cam selection; 340 with manifolds [Re: dd340] #2216675
12/18/16 11:06 PM
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Put a gear and a sure grip in it and get you some tires and you'll feel like you gained 50 horses.


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Re: Cam selection; 340 with manifolds [Re: dd340] #2216773
12/19/16 01:48 AM
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Originally Posted By dd340
Originally Posted By BSB67
Originally Posted By dd340
I have been running a 69 dart 340 for a few years with a racer brown cam 220* .460 lift cam. It works really good but I would like to increase the horsepower. Any recommendations for a small block running stock manifolds? I would consider a solid cam but would prefer hydraulic. I have stock 2.02 valve heads and stock 10.5 compression.
My original idea was to put headers on it but TTI's and full exhaust run close to 2k in Canada so I'm hoping for a better option.
Opinions?


Based on your opening question and some of your responses I think we need to know your budget, and your expectation. Certainly you can put headers on the car for far less than $2000. I also think that that a different cam will put more power in it too.

Your car/motor seems to run about right for what it is, and making any one change will not likely yield a huge gain.

Are you running your current combo on pump gas? If so, this surprises me. What is you cranking cylinder pressure?

If you go to a cam swap, I would go with a small solid


Currently yes I only use pump gas but it tends to knock on 91 octane so I pretty much only run it on 94 which I have easy access to.
If I go the headers route I will also swap the cam since I think it makes sense to maximize the benefits of it.
It's not so much a budget issue as much as cost per benefit, 2k just seems like a lot for an exhaust swap. The exhaust I have now is all original so I kind of like it as is. My hope was to gain 30hp without switching out my current exhaust but that may be unrealistic.


102 is a Nice MPH. My opinion? A good set of DA shocks will be a better ROI than the same amount on chasing the HP left on the table.

Re: Cam selection; 340 with manifolds [Re: dd340] #2216947
12/19/16 01:45 PM
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IMO, you're not going to find 30hp from a "simple" cam swap.
Swap for a streetable roller??? There might be 30hp there.

When the intake and exhaust are both a "cork" limiting airflow through the motor, finding extra power is a challenge. You need to move more air, so you can mix it with more fuel.

If you're really set on retaining the stock appearance, and want a noticable increase in power( and seat of the pants feel), more cubes is your best bet.

When you get tired of that, you can upgrade the intake/exhaust and really bump the power level up.


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Dealer for Comp Cams/Indy Heads
Re: Cam selection; 340 with manifolds [Re: dd340] #2217548
12/20/16 04:09 AM
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While a TTI header setup would be nice,there are plenty of good A-body header choices with a lesser price point. Especially for a street based engine.I think a t102 mph you should be in the high 12 second range.Chassis as mentioned or gearing change??What transmission do you have?

Re: Cam selection; 340 with manifolds [Re: RTSrunner] #2217598
12/20/16 10:08 AM
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Originally Posted By RTSrunner
While a TTI header setup would be nice,there are plenty of good A-body header choices with a lesser price point. Especially for a street based engine.I think a t102 mph you should be in the high 12 second range.Chassis as mentioned or gearing change??What transmission do you have?


I have a 727 trans, the converter is really tight, it only flashes to around 1800 rpm.
I have been looking at Doug's headers. They are quite a bit cheaper than TTI especially since there is a discount at autozone right now.
Are there any other headers that fit and won't drag on the ground?

Re: Cam selection; 340 with manifolds [Re: dd340] #2218072
12/20/16 11:10 PM
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Ok, I know it's not the same,but I' m running a 4" stroke 408 through stock 1968 340 intake and stock 1968 340 exhaust manifolds best of 12.10 113 mph 4.10 gear with a very small tire. Best 60' 1.71. The only real "exotic" part Dwayne Porter x heads. My point is there is a lot of performance in the 340 intake and exhaust manifolds cars weighs 3645lbs. Pump gas motor. Aluminum heads/headers/better intake sure you can make more power,but don't discount what you can get out of those stock parts.


best of 11.39 at 117 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]
Re: Cam selection; 340 with manifolds [Re: ScottSmith_Harms] #2219417
12/23/16 01:49 AM
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Originally Posted By ScottSmith_Harms
You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 280, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02


I am building a mild 360 now for a daily Duster.. well nice days but to drive it a lot. 4 speed. 3.55 gears. I am really really wanting to use manifolds. I hate headers for street cars. Care to shine some light on which manifolds? With a mild cam, rpm performer intake, and smog 360 heads, think 325 hp is possible on pump gas?

Re: Cam selection; 340 with manifolds [Re: da50r] #2219471
12/23/16 09:32 AM
12/23/16 09:32 AM
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Ottawa, ontario
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dd340 Offline OP
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Originally Posted By da50r
Originally Posted By ScottSmith_Harms
You don't need headers to make power. Will you (usually) make more power with headers and exhaust? Yes. Do you need the difference? In street driving, usually not. I have one of each, both are stroker 340's, 422 and 426 cubes respectively. Both are built very similarly, similar cams ported iron heads that flow at around 280, both in 71 A-body cars with manual transmissions and 3,91 gears. Both have both been dyno'd so I have real data on them. The 426 cam specs are attached, the 422 was a very similar grind. The 426 made 450hp and 500tq. These numbers were made with exhaust manifolds, stock iron intake, stock Thermoquad carb, and everything else externally stock down to the belts and hoses. Now, the 422. It has TTI headers, mandrel bent 3" exhaust, a single plane intake, a Holly 950HP carb, 7AL ignition, and all the other 10 cent tricks. It made 530hp and 520tq on the dyno.

So, bottom line, A LOT of $ and optional equipment (as a package that works well together) resulted in roughly 75hp and 20lbs of tq most things being equal if not at least similar.

On the street you simply don't need the extra hp. the 450 engine will blaze the tires at any speed and torque is so close it feels the same.

.02


I am building a mild 360 now for a daily Duster.. well nice days but to drive it a lot. 4 speed. 3.55 gears. I am really really wanting to use manifolds. I hate headers for street cars. Care to shine some light on which manifolds? With a mild cam, rpm performer intake, and smog 360 heads, think 325 hp is possible on pump gas?


Pretty much any manifolds will work up to 325hp. My set up uses the 68-70 340 manifolds but you could use pretty much any 340-360 manifolds.
My set up is good for about 325hp and is very mild
Around 10.0 compression
Edelbrock dual plane intake, go with an air gap if you can find one
Stock 2.02 valve heads
600 cfm edelbrock carb or even a carter avs should work
220 @.050 duration .460 lift cam from racer brown
That is all it should take for a 360 to put out an easy 325 hp and still be really mild and get decent gas mileage too. I have gotten around 18 mpg on a highway drive with 3.23 gears
I also balanced my rotating assembly and made sure the block was machined properly. Good ring seal is important.

Re: Cam selection; 340 with manifolds [Re: da50r] #2219472
12/23/16 09:38 AM
12/23/16 09:38 AM
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Prospect, PA
BSB67 Offline
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Originally Posted By da50r


With a mild cam, rpm performer intake, and smog 360 heads, think 325 hp is possible on pump gas?


.9 to 1.0 hp/cuin is pretty easy. You don't need anything exotic, but good parts and an eye to the details matter.

Re: Cam selection; 340 with manifolds [Re: dd340] #2219560
12/23/16 01:20 PM
12/23/16 01:20 PM
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Frostbitefalls MN (Rocky&Bullw...
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Research how well your current mufflers flow, to see if they match the pipe dimensions. The book How to Build Horsepower, second edition, has a ton of info on exhaust systems and getting the most out of them. If your current mufflers are restrictive, you can figure out roughly what a change is worth based on how good the rest of your system is, and how much the mufflers are choking the system. To get the flow increase you want you might need to use reducers to go bigger on the entry/exit of the muffler you want to go to to get extra flow.
My next move would be a GOOD converter, after that, posi, plus suspension tricks to get some weight transfer. since you want a decent lockup at cruise based on your comments. I am not sure how much can be done to get the manners you want plus a good stall increase, but a conversation with a couple of top converter builders ought to give you something to go on. A good converter is worth more ET than a gear change, and a stroker would really pick up the 60 ft with just a better converter and posi plus good tires, if you really want to turn up the wick.

Last edited by gregsdart; 12/23/16 01:24 PM.

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Re: Cam selection; 340 with manifolds [Re: dd340] #2219738
12/23/16 05:56 PM
12/23/16 05:56 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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10:1 .030 over 340, 587 heads with 2.02 valves and minor bowl blend, Performer manifold, Holley 650dp, Comp 268h cam, Mancini 1.5 roller rockers, 1 5/8" x 3" headers.

image.jpg

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Cam selection; 340 with manifolds [Re: dd340] #2220791
12/25/16 07:00 PM
12/25/16 07:00 PM
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cdp Offline
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I'd be interested on Paul Petcou's Pure Stock 71 340/4spd build. 12.61 in a 4spd with 4.56 gears. I'd think a well tuned, nearly stock 340 would be around 350 ponies.

Re: Cam selection; 340 with manifolds [Re: dd340] #2220796
12/25/16 07:20 PM
12/25/16 07:20 PM
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Porter67 Offline
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What would possibly bee a good vert for the combo being tossed around?

Arnt manifolds known to crack easily? I recall cracking many 340 hp drivers side units, but I think they might of been on the lean side.

Re: Cam selection; 340 with manifolds [Re: dd340] #2220850
12/25/16 09:43 PM
12/25/16 09:43 PM
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Spokane Washington
ScottSmith_Harms Offline
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If the stock appearance is not important the 1993/93 Dodge Dakota 318 manifolds (53006618/19 castings) flow as well (or better?) Than the 68-70 340 units, plus are compact and fit most any car.

2016-12-25 15.34.58.jpg
Re: Cam selection; 340 with manifolds [Re: dd340] #2220871
12/25/16 10:23 PM
12/25/16 10:23 PM
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Central NC
gch Offline
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A sure grip would help.Maybe a converter since the motor is out.Headers if you want.With/without headers do a nice mandrel 2.5 exhaust with free flowing mufflers.Rejet carb as needed and roll.
Build a stroker short block while you are enjoying this one.

Re: Cam selection; 340 with manifolds [Re: dd340] #2220882
12/25/16 10:49 PM
12/25/16 10:49 PM
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Spokane Washington
ScottSmith_Harms Offline
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Yea, my point about pushing a stroker is two fold, nothing beats torque around town no matter how much peak HP your engine makes, and I've yet to hear anyone say:

"I sure wish I would have just built a stock stroke engine" after driving a stroker

drive

Re: Cam selection; 340 with manifolds [Re: ScottSmith_Harms] #2220922
12/26/16 12:38 AM
12/26/16 12:38 AM
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Ottawa, ontario
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dd340 Offline OP
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Originally Posted By ScottSmith_Harms
Yea, my point about pushing a stroker is two fold, nothing beats torque around town no matter how much peak HP your engine makes, and I've yet to hear anyone say:

"I sure wish I would have just built a stock stroke engine" after driving a stroker

drive


I hear you on that. I have a stroker 416 in my 87 ram and with 4:10 gears it is literally impossible to get to full throttle in first or 2nd gear without putting it sideways. Although admittedly the tires are pretty useless and I should have drag radials on it.

Re: Cam selection; 340 with manifolds [Re: cdp] #2221588
12/27/16 01:41 PM
12/27/16 01:41 PM
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So. Burlington, Vt.
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Originally Posted By cdp
I'd think a well tuned, nearly stock 340 would be around 350 ponies.


In 2001 Dulcich dynoed a stock 340 at Westech.
With an Edelbrock 800 carb it made around 315hp. With headers it made like 330hp.

Shortly after the 2003 Engine Masters competition it was discovered why the results from the Westech dyno always seemed so "good". The barometer was way off which caused the computer to spit out corrected numbers that were 5% high(if you do a search you can find info about this).
So, take 5% off the 315hp exhaust manifold test and you're at 299hp, 5% off the 330hp header test and you're at 313hp.
And those are with the 800cfm carb, so you'd be down even farther with a correct 340AVS on the motor.
I seriously doubt there is going to be 50+hp found by "tuning".


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Cam selection; 340 with manifolds [Re: fast68plymouth] #2221603
12/27/16 02:14 PM
12/27/16 02:14 PM
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Prospect, PA
BSB67 Offline
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The 340 was probably the only wedge engine that was not factory over rated. the 275 hp is actually a pretty good hp number for an original 340. MP put it in the 275-290 range, and 315 with headers and carb.

Re: Cam selection; 340 with manifolds [Re: dd340] #2221641
12/27/16 03:20 PM
12/27/16 03:20 PM
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Southern Michigan
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I have built tons of 340's and built tons of cars since the mid 70's. You really do not state any good particulars about the car. So I am going to assume when you ran the car was that with slicks or street tires. If not the converter you have is killing the 60ft. but allowing you not to spin the non slicks hard. Running 13.72 at 102 you should have a 1.90 something 60ft. With a 3.23 open rear and your 1800 converter your car must leave flat for about 30 to 40 ft. then come alive. Your converter is not letting the engine rev up into a good power band until 30 ft out. Here is a cheap remedy. You can get a cheap converter 2500 stall. 11" for $300 new. You need to curve the distributor for a lot better gains as stated by someone earlier. You will see a big difference in the motor and performance. When all that is done put a 1" carb aluminum spacer. All that for under $500. That's a good start at a cheap price. I had a great combo. I loved the old Direct Connection 521 Solid. I used 273 Adjustable rockers with longer adjusting screws. 30 over with stock comp. X heads with stock valves and a little bowl and gasket porting. Weiend 7545 Single plane with welded up heat risers. Ran better with a Holley Strip Dominator I might add back then. Holley 750 Dbl pumper with 90 jets rear and 86 frt. Direct Connection Racing cast iron electronic dist. Curved of course. Trans was a Joel's on Joy mild 727 with a 3500 B&M converter 10". Rear end was a 742 with 4.56 gears. In a 74 Dart Sport. Lots of little suspension tricks. Stock springs was a 360 Hipo car now on the east side of Detroit. It ran 11.60. later on a custom 904 tran by Joel's same motor and everything else. 10.95. What a difference. Motor was not that radical and that was way before any stroker kits. I still have that drive train been sitting since the 90's

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