AFR 185s....331ci or 347??

[allcarfan]

Will AFR 185s be fine on a 331 rather than a 347? I have a comp cams xe282hr camshaft.

is that 16 extra cubic inches going to make that much of a difference? I have the EXACT same combo that the AFR website has. On a 302 this combo made 455 hp. I am assuming that on a 331 or a 347...it should make close to 500. Can anyone tell me how much of a difference I would see between these two strokers?

Shane

 

[10secgoal]

A smaller motor with be more comfortable reving high. I really don't think it is all that big of a difference. The the 347 will produce a slight torque advantage because of the longer stroke, but will not last as long as a 331.

 

[SadbutTrue]

I think they'd work fine, you're talking a measly 16 cube difference. Should work nicely.

 

[allcarfan]

so many decisions!!! Anyone need a 347 crank?!

 

[Mustang67Coupe]

what ya selling it for and whats the specs of the crankshaft? not sure if im ready to purchase one, but never know...

 

[allcarfan]

you can PM ME if you want to about them...

One is a brand new cast hawks racing crankshaft...virgin

the other is unknown brand, but looks a LOT better than the hawks crank, i believe its been balanced to 28oz. This one has been turned 20/20

$150 each

 

[washMO66]

I have a 347ci with ported and polished AFR 185's and an XE274HR and I am getting 455HP, 475 torque with a Mighty Demon 650 and a Vic Jr. Could probably get more with more carb but it does fine for a street strip combo.

I shift at 6200RPM and have loads of bottom end torque with a 2500 stall and 3:73 gears in a 3Klbs car. Street tires will smoke all the way until I shift into 3rd with my C4.

TB

 

[allcarfan]

455/475tq to the wheels right?

 

[2bav8]

That's at the crank folks

 

[washMO66]

That's at the crank folks

2b is correct, at the crank.

I wish it was at the wheels.........hold on tight!!!!!!!

 

[allcarfan]

that same combo with an xe282hr camshaft makes 455 hp on a 302...according to...Westech Performance. They were also using 1 3/4" headers and an MSD digitial ignition.

Has your car been dyno-tuned?

 

[washMO66]

I would like to get it on a chassis dyno very soon. How much % of HP do you lose through the drive train to the wheels on average?

 

[allcarfan]

C4? Id estimate about 15-17%

 

[washMO66]

Yep C-4....

 

[10secgoal]

I thought c-4 where like 20 % ? With the stall and all....

I had a unbalanced driveshaft soaking up the HP on the dyno, but it didn't effect the Trq. 473 hehe fun fun is right !

 

[washMO66]

Anyone know where in the STL, MO area I can get my car on a chassis dyno?

 

[allcarfan]

10sec....i think an AOD is more like 20-25%