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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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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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).
live every 24 hour block of time like it's your last day on earth
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Re: Cam selection; 340 with manifolds
[Re: dd340]
#2215629
12/17/16 01:54 PM
12/17/16 01:54 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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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
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Re: Cam selection; 340 with manifolds
[Re: dd340]
#2215655
12/17/16 02:35 PM
12/17/16 02:35 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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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.
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Re: Cam selection; 340 with manifolds
[Re: dd340]
#2215712
12/17/16 03:44 PM
12/17/16 03:44 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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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.)
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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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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
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
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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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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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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 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.
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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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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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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). 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.
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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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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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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 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.
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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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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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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. 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
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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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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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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.
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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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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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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 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?
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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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Joined: Jul 2007
Posts: 11,836 Florida
mopar346
Let me tell ya about fat chicks!
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Let me tell ya about fat chicks!
Joined: Jul 2007
Posts: 11,836
Florida
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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.
Careful, your character's showing!
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Re: Cam selection; 340 with manifolds
[Re: joes68340s]
#2216288
12/18/16 03:52 PM
12/18/16 03:52 PM
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Joined: Jan 2003
Posts: 27,468 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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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. Running 13.7's with 3.23 open with that cam, and stock manifolds sound pretty well tuned already
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Re: Cam selection; 340 with manifolds
[Re: autoxcuda]
#2216305
12/18/16 04:12 PM
12/18/16 04:12 PM
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Joined: Jan 2003
Posts: 727 Ottawa, ontario
dd340
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 727
Ottawa, ontario
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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. 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.
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Re: Cam selection; 340 with manifolds
[Re: dd340]
#2216528
12/18/16 09:14 PM
12/18/16 09:14 PM
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Joined: Feb 2005
Posts: 4,314 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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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? 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.
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