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sickolds 05-30-2010 09:12 PM

chevy 383 problem
 
i just built a chevy 383 and it dosent have big power like i though it would :confused:

Custom10 05-30-2010 09:37 PM

tell us what you built, just 383 is not enough info to go on.

sickolds 05-30-2010 09:44 PM

summit pistons 17cc dish vortec64cc heads eagle 383 crank 5.7 rods 224/224 summit cam flat lifters summit intake holley 750 vac sec

Custom10 05-30-2010 10:05 PM

OK so what is this motor in, what type of tranny, stall speed, rear gear ratio?

sickolds 05-30-2010 10:25 PM

trany is B&M th350 stock stall in a odsmobile cuttlas 1982 rear is stock i had a mild 350 in it and it was better from take off but not so good at high rpm

techinspector1 05-30-2010 10:43 PM

At 9.35:1 static compression ratio, the cylinder pressure may be a little light for a 224/224 cam. You may have been better off using a cam with 215-218 degrees @0.050" tappet lift. Either that, or use the 224/224 cam with up around 10.0:1 static compression ratio. Exchange the stock converter for one that stalls at 2500/3000. That'll get you past the soggy part of the cam. Put some gear in the rear, at least a 3.73.

Lose the Summit intake, replace with a Edelbrock RPM or Weiand Stealth. Bolt on some long-tube, equal-length headers with 1 3/4" primary tubes. Fabricate an X or H right after the collectors, use 2 5/8" or 2 3/4" pipes, through the mufflers of your choice, back to the rear bumper.

What did you do for valve springs? Are these L31 heads or aftermarket?

sickolds 05-30-2010 10:50 PM

were did that cop 9*** com from i was told it is 9.7 these is onky my second build

sickolds 05-30-2010 10:53 PM

yes sir these are vortec oem heads

cobalt327 05-30-2010 11:04 PM

Quote:

Originally Posted by sickolds
were did that cop 9*** com from i was told it is 9.7 these is onky my second build

It may well be- what is the quench at? If the block is zero decked, the CR will be about w/9.7:1 0.041" head gaskets. And should be OK w/your present cam.

cobalt327 05-30-2010 11:10 PM

If your rear gears are stock, chances are good they need to be changed to a lower (higher number) set. A torque converter to match the onset of serious torque production by the engine will be needed, something around a 3000 rpm stall range, give or take.

sickolds 05-30-2010 11:11 PM

1.433 pistons decke higt is stock

cobalt327 05-30-2010 11:27 PM

Quote:

Originally Posted by sickolds
1.433 pistons decke higt is stock

And what's the head gasket thickness? But I can tell you, this isn't looking good...

cobalt327 05-30-2010 11:37 PM

Something like 9.24:1 w/a 0.041 gasket, anyway. Given a 5.7" rod, 9.025" unmilled stock deck height, nothing subtracted for bearing clearance.

The 9.7 CR you were told would have been w/a zero deck and a 0.041 quench.

techinspector1 05-30-2010 11:44 PM

Quote:

Originally Posted by sickolds
yes sir these are vortec oem heads

Are they bone-stock or did you change out the valve springs?

Custom10 05-31-2010 08:37 AM

Quote:

Originally Posted by cobalt327
And what's the head gasket thickness? But I can tell you, this isn't looking good...

diddo that


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