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Ideas for a stout stock stroke 340 build. #1673972
09/18/14 11:33 PM
09/18/14 11:33 PM
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Portage,michigan
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I am thinking about building a 30 over 340 "big" motor to have as a backup to this 318, and perhaps at some point replace it

I have access to a nice standard bore 340 with its unturned steel crank, bunch of stuff I wouldn't use,( stock rods and pistons)several stock 340 pans, timing covers, etc for real cheap.

I just wondered if say cnc procomp heads, moderate roller cam, zero deck flat top pistons could make 550 horsepower or better? Or any other heads, that are cheap and available
If not it wouldn't be a significant enough upgrade to be worth doing.


In my old age I am actually back into thinking Dusters/ Darts/ Demons with 340's in them are cool.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673973
09/18/14 11:39 PM
09/18/14 11:39 PM
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550hp is one thing, but streetable is gonna be another at that small cubic inch. You gonna drive it?

Re: Ideas for a stout stock stroke 340 build. [Re: Hot 340] #1673974
09/18/14 11:51 PM
09/18/14 11:51 PM
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Quote:

550hp is one thing, but streetable is gonna be another at that small cubic inch. You gonna drive it?




Yep, want to drive it around, not have it eat springs, and at worst mix pump premium with 110, better just pump gas. And no E85. Now that I make things easy, is it possible?
I figure it's got to make 75 more horse than what I have, and should with more cubes, roller Vs hydraulic, better heads than what these magnum RT's are(low 270 peak).

Last edited by B3422W5; 09/18/14 11:56 PM.

69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673975
09/19/14 12:17 AM
09/19/14 12:17 AM
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mshred Offline
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subscribed to hear what others think.


B3, have you weighed the new car with you in it?

Re: Ideas for a stout stock stroke 340 build. [Re: mshred] #1673976
09/19/14 12:20 AM
09/19/14 12:20 AM
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3415. It isn't going to get any lighter unless I lose some weight off my 300 pound carcass


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673977
09/19/14 01:05 AM
09/19/14 01:05 AM
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junction city oregon
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What is the point of stock stroke and heavy car? Go 416 and make 550 no problem.
Even at those cubes you're gonna spin it to 6500+.
A 340 at 550hp won't have much torque. So without 4.88 gears it'll bea dog anyways.

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673978
09/19/14 01:58 AM
09/19/14 01:58 AM
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Romeo MI
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Don its much easier with a 416... hell you can make
over 550 hp and still run 87 octane... spend a bit more
now and save on all the fuel costs and make more torque..
I'm at 590 hp on 416 with 87 octane with W-2s

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673979
09/19/14 09:10 AM
09/19/14 09:10 AM
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Quote:

I am thinking about building a 30 over 340 "big" motor to have as a backup to this 318, and perhaps at some point replace it

I have access to a nice standard bore 340 with its unturned steel crank, bunch of stuff I wouldn't use,( stock rods and pistons)several stock 340 pans, timing covers, etc for real cheap.

I just wondered if say cnc procomp heads, moderate roller cam, zero deck flat top pistons could make 550 horsepower or better? Or any other heads, that are cheap and available
If not it wouldn't be a significant enough upgrade to be worth doing.


In my old age I am actually back into thinking Dusters/ Darts/ Demons with 340's in them are cool.





You need to talk to Bondo Bob. He has a pump gas 422 in his Dart Swinger with CNC Procomp heads. It is a full stock interior street car, and went 10.50's on the motor. He sprayed it last weekend at MMW and went 6.1? in the 1/8. What your looking for can definitely be done!

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673980
09/19/14 06:01 PM
09/19/14 06:01 PM
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A 416, eddy headed hydro roller motor at 11:1 with 1.875 headers and a strip dominator will EASILY do 575 at 6000 rpm's. Turn it 6800 with the correct cam and it will go over 600. It will idle at 1000 rpm's.

A solid tight lash roller will do 675-680.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Ideas for a stout stock stroke 340 build. [Re: madscientist] #1673981
09/19/14 06:54 PM
09/19/14 06:54 PM
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Frankly, I have already had 9 sec, 10 sec, and 11 sec small block stroker motors in my old car. No doubt they will make more power.
This build will be just stock stroke. Don't mind having less torque. Less torque won't break this 8.75 rear I don't want to replace. And will hook easier with this stock suspension deal I have.
I have never had a 340 that will run 10's, and my hope is that a well thought out build will achieve that in the current heap that I have.
I am probably hard headed but just want something I haven't already had next time. Be it harder to do or not


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: madscientist] #1673982
09/19/14 06:56 PM
09/19/14 06:56 PM
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Quote:

A 416, eddy headed hydro roller motor at 11:1 with 1.875 headers and a strip dominator will EASILY do 575 at 6000 rpm's. Turn it 6800 with the correct cam and it will go over 600. It will idle at 1000 rpm's.

A solid tight lash roller will do 675-680.




80hp from a solid roller?

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673983
09/19/14 07:07 PM
09/19/14 07:07 PM
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I don't think it's impossible just not streetable or inexpensive. My 380 does 550hp but is a 48* W-2 mini stroker that runs on 110. Much easier to follow Mr P's idea on a 416 that runs on 87. You'll be happier in the long run.

Re: Ideas for a stout stock stroke 340 build. [Re: Belvedere2] #1673984
09/19/14 07:20 PM
09/19/14 07:20 PM
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Quote:

I don't think it's impossible just not streetable or inexpensive. My 380 does 550hp but is a 48* W-2 mini stroker that runs on 110. Much easier to follow Mr P's idea on a 416 that runs on 87. You'll be happier in the long run.




I will already have the block and crank, can use shelf diamond pistons and probably like a scat H beam rod. Won't be real expensive at all. Lots of stuff I already have.
Don't really care about having to maybe mix 110. It's 6.99 a gallon here, and it's not like I have the time to log a ton of miles on the street. So even if it costs me 300 extra a summer for fuel( unlikely) that isn't enough of a negative to matter to me. Don't think it needs to be radical to run 10's even in a 3400 pound car. Just need good heads.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673985
09/19/14 07:42 PM
09/19/14 07:42 PM
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Quote:

Quote:

I don't think it's impossible just not streetable or inexpensive. My 380 does 550hp but is a 48* W-2 mini stroker that runs on 110. Much easier to follow Mr P's idea on a 416 that runs on 87. You'll be happier in the long run.




I will already have the block and crank, can use shelf diamond pistons and probably like a scat H beam rod. Won't be real expensive at all. Lots of stuff I already have.
Don't really care about having to maybe mix 110. It's 6.99 a gallon here, and it's not like I have the time to log a ton of miles on the street. So even if it costs me 300 extra a summer for fuel( unlikely) that isn't enough of a negative to matter to me. Don't think it needs to be radical to run 10's even in a 3400 pound car. Just need good heads.


Hmmm. True. Do you think W-9s would be feasible? Not sure but they might flow in the 300s with mild cleanup. Course that makes acces. parts more exotic. I'm just not well versed in other heads. I like my W-2s.

Re: Ideas for a stout stock stroke 340 build. [Re: Belvedere2] #1673986
09/19/14 07:55 PM
09/19/14 07:55 PM
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Well I'm guessing very light rods and pistons, heads that will flow around 300cfm, maybe to keep it old school tunnel ram with a pair of 660's solid roller with the best money can buy in valve train parts. And leave the line 5k shifting at 8k.
There was a red white and blue 70 swinger that ran at the local track about 25 to 30 years ago that was running low 9's hi 8's with a destroked SB, I think he told me it was a 305ci, left the line at 7k and shifted at 9k peaple backed away from the water box area when he reved that thing up. It was bad a**!!

Re: Ideas for a stout stock stroke 340 build. [Re: Belvedere2] #1673987
09/19/14 07:59 PM
09/19/14 07:59 PM
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Quote:

Quote:

Quote:

I don't think it's impossible just not streetable or inexpensive. My 380 does 550hp but is a 48* W-2 mini stroker that runs on 110. Much easier to follow Mr P's idea on a 416 that runs on 87. You'll be happier in the long run.




I will already have the block and crank, can use shelf diamond pistons and probably like a scat H beam rod. Won't be real expensive at all. Lots of stuff I already have.
Don't really care about having to maybe mix 110. It's 6.99 a gallon here, and it's not like I have the time to log a ton of miles on the street. So even if it costs me 300 extra a summer for fuel( unlikely) that isn't enough of a negative to matter to me. Don't think it needs to be radical to run 10's even in a 3400 pound car. Just need good heads.


Hmmm. True. Do you think W-9s would be feasible? Not sure but they might flow in the 300s with mild cleanup. Course that makes acces. parts more exotic. I'm just not well versed in other heads. I like my W-2s.




Those cnc pro comps like bondo has went high 280's on a reputable bench. He built a 60 over 340 with 4 inch crank at 9.5 compression and has already been 10.57 in his bench seat swinger. I figure his crank is probably 3 tenths better than similar build stock stroke. But I would have well more than 9.5 compression. Think a head like that
will sneak into the 10's with stock stroke. Without working up a ton of sweat and be very street able.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: mshred] #1673988
09/19/14 09:11 PM
09/19/14 09:11 PM
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Quote:

Quote:

A 416, eddy headed hydro roller motor at 11:1 with 1.875 headers and a strip dominator will EASILY do 575 at 6000 rpm's. Turn it 6800 with the correct cam and it will go over 600. It will idle at 1000 rpm's.

A solid tight lash roller will do 675-680.




80hp from a solid roller?




Guess I should have added "and 7500" but yes. At this point, if you have all the pieces I would just skip the hydraulic roller. But some guys just don't want to bother.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673989
09/19/14 09:16 PM
09/19/14 09:16 PM
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Quote:

I am thinking about building a 30 over 340 "big" motor to have as a backup to this 318, and perhaps at some point replace it

I have access to a nice standard bore 340 with its unturned steel crank, bunch of stuff I wouldn't use,( stock rods and pistons)several stock 340 pans, timing covers, etc for real cheap.

I just wondered if say cnc procomp heads, moderate roller cam, zero deck flat top pistons could make 550 horsepower or better? Or any other heads, that are cheap and available
If not it wouldn't be a significant enough upgrade to be worth doing.

I apologize for not reading closer.

Let me say this about what you wrote: not sure on the pro comp heads. Didn't like the BB heads I have done but they are ok. If you spend the time on the intake manifold (most guys skip over this but it is a big deal) and get it correct, and your headers are good 550 is not out of the question. 500 is 1.47 HP/CI so it needs to be properly spec'd. 550 is 1.6 HP/CI. You will have to have you crap wired tight to get there but it is doable.


In my old age I am actually back into thinking Dusters/ Darts/ Demons with 340's in them are cool.





Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Ideas for a stout stock stroke 340 build. [Re: madscientist] #1673990
09/19/14 09:38 PM
09/19/14 09:38 PM
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Just reread an old Mopar Muscle magazine article from 2003. They took a stock stroke 340, bolted on W9 heads that were pretty much stock( minor work, they went 280@.600) and with a 260@50 roller made 602 horse at 7000rpm
I don't know how much better that head is than the procomp cnc I am thinking about, but it can't be much better, if it is at all


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Ideas for a stout stock stroke 340 build. [Re: B3422W5] #1673991
09/20/14 12:45 AM
09/20/14 12:45 AM
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Between a rock & a hard place
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Don, contact or Google Mike @ MRL Performane. He posted on another board not too long ago a 3.310" stroke 340 build he did that was pretty impressive and seemingly streetable.

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