Building 340 stroker need input

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Outlaw49801

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I am soon bringing my stock 1970 340 block down to hughes to get the machine work and cryogenic treatment done. So now the question should I go with A.) Go with RPMs forged 3.55" stroker crank making 372 cu. in or B.) K1 technologies 3.79" forged crank making 394 cu.in here is why I chose these two with the car I am building I am limited to the headers that are available I will be using the early A body step header from TTI and already am having them modify the collector making it 3.5" instead of the standard 3". I will be using the RHS "X" heads super prepped from hughes engines an air gap intake and a bigs 950cfm stage 7 carb. I will not use a 4" crank because I do not think the headers will allow the engine to work at it maximum capacity. The weight of the car with the driver will be right at 2800# trans is a 904 being built by Rick at A&A gonna use hardened input and output shafts. The 372 I can use a hotter cam and bump up the compression still using pump gas not having a detonation problem do to the weight of the car there for increasing the rpms and hp but losing torq which I feel in my case is no a major issue. Or if I go with the 394 I will increase torque be able to use a taller gear and increase ci there for making up the lost hp from not having the higher comp and more rpms from the smaller cube engine. what some more insite on this help
 
Outlaw49801 said:
I am soon bringing my stock 1970 340 block down to hughes to get the machine work and cryogenic treatment done. So now the question should I go with A.) Go with RPMs forged 3.55" stroker crank making 372 cu. in or B.) K1 technologies 3.79" forged crank making 394 cu.in here is why I chose these two with the car I am building I am limited to the headers that are available I will be using the early A body step header from TTI and already am having them modify the collector making it 3.5" instead of the standard 3". I will be using the RHS "X" heads super prepped from hughes engines an air gap intake and a bigs 950cfm stage 7 carb. I will not use a 4" crank because I do not think the headers will allow the engine to work at it maximum capacity. The weight of the car with the driver will be right at 2800# trans is a 904 being built by Rick at A&A gonna use hardened input and output shafts. The 372 I can use a hotter cam and bump up the compression still using pump gas not having a detonation problem do to the weight of the car there for increasing the rpms and hp but losing torq which I feel in my case is no a major issue. Or if I go with the 394 I will increase torque be able to use a taller gear and increase ci there for making up the lost hp from not having the higher comp and more rpms from the smaller cube engine. what some more insite on this help
Click to expand...
Check this out before you do anything....
http://www.carcraft.com/techarticles/ccrp_1006_small_block_mopar_stroker_dyno_test/index.html
 
Street car, longer the stroke the better, and the cam choice can go very far in negating any issues with the headers abilities.
Race car, it really deosnt matter but I'd probably go shorter stroke because of limited tire size as it would give me another way to ease the hit on the tires.
 
Maybe the original poster could mention the cams he's looking at and the HP goals/et goals of his car? So as to see if the headers are really that much of a limiting factor. Or maybe there are other ways around the issue.
 
Recently talked to Dave Hughes and decided on going with the K1 technoligies forged 4.00" crank horse power will be around 575, torque around 530 and the headers will not pose an issue and tire size will be 28/10.5-15 I will be using caltrac bars with caltrac mono springs and being that I amdoing the work to get that size tire I will make the wells a bit bigger to be able to fit 29.5/13.5-15's just incase I have traction troubles with the smaller tire we figure all motor we should run around 1.40 60' time and around a 10.25 1/4 mile time around 127 mph
 
I will keep updates posted and will post all specs and parts once I get the build sheet I will also post the dyno results onceit it built
 
Which camshaft have you chosen? Hyd, Solid, Roller, Hyd Roller?
 
Gonna venture with a hyd. Flat tappet first if not what works will have to change a few things around and go with a hydraulic roller
 
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