Which Block and Heads?
Thread Starter
Racer
Joined: Jul 2007
Posts: 478
Likes: 1
From: Nesquehoning PA
Which Block and Heads?
I want to build a 5.7l engine for my 85 Coupe. This will be strictly for street.
It will have a centrifugal type supercharger with fully ported heads as the main means of developing extra power. I would also like to use a roller cam , roller rockers, and a gear driven timing set. My aim is to have about 550-600 bhp when finished.
I realize that any build of this nature will require a forged rotating assembly and forged pistons. I also realize that the rest of the car will need to be altered to be able to utilize this much power in a safe manner.
Right now I would like to find out which block and heads would be the best candidates to base this on.
Thanks
It will have a centrifugal type supercharger with fully ported heads as the main means of developing extra power. I would also like to use a roller cam , roller rockers, and a gear driven timing set. My aim is to have about 550-600 bhp when finished.
I realize that any build of this nature will require a forged rotating assembly and forged pistons. I also realize that the rest of the car will need to be altered to be able to utilize this much power in a safe manner.
Right now I would like to find out which block and heads would be the best candidates to base this on.
Thanks
Burning Brakes
Joined: Oct 2005
Posts: 1,176
Likes: 0
From: Suffolk Va
Forged 383 assembled in a new gmpp 1 piece 4 bolt main block, AFR 195cc Eliminators, Procharger D1sc, Miniram or First Intake, Custom Blower Cam from Comp, Crane, Isky...ect, and TUNE TUNE TUNE!
Last edited by CRV3TT3; Jan 16, 2008 at 10:40 AM.
Pro
Joined: Dec 2002
Posts: 704
Likes: 16
From: Dallas Texas
You're talking about 450-525rwhp, correct? My "budget" suggestion:
--Forged rods 5.7"
--Forged blower pistons
--speedpro rings
--stock crank
--ARP main and head bolts
--blower cam
--ported heads
--intake
--D1sc
--8-rib drive conversion
Unless you're planning on side-stepping the clutch at 5k with slicks, you might want to consider going on the cheap (suspect you'll get plenty of advise on how to build a bullet proof shortblock, so I thought I'd chime in for those of us who might be on a budget).
For the HP goals you stated, I think can get away with the stock cast crank w/ARP studs, some Scat or other medium quality H-beam rods, SRP low compression pistons, and Speedpro rings gapped slightly on the loose side. You may want to check the specs on your stock cam as many have good blower cam characteristics and they'll pass smog,too! I also think porting your stock heads and good aftermarket intake should get you where you want to go.
With the 5.7" rod and stock stroke, you'll have a better ring-pack and more skirt. You won't miss the additional torque a stroker gets you as you'll still be able to haze 3rd gear and run 11s.
The trick is going to be getting enough belt wrap to drive the blower w/o slip to make 12-14# boost to get you in the HP ball park. See if anyone is offering an 8-rib conversion for your car (Blowerworks??).
That's just my two cents so take it for what it is worth.
Regards,
Chris
--Forged rods 5.7"
--Forged blower pistons
--speedpro rings
--stock crank
--ARP main and head bolts
--blower cam
--ported heads
--intake
--D1sc
--8-rib drive conversion
Unless you're planning on side-stepping the clutch at 5k with slicks, you might want to consider going on the cheap (suspect you'll get plenty of advise on how to build a bullet proof shortblock, so I thought I'd chime in for those of us who might be on a budget).
For the HP goals you stated, I think can get away with the stock cast crank w/ARP studs, some Scat or other medium quality H-beam rods, SRP low compression pistons, and Speedpro rings gapped slightly on the loose side. You may want to check the specs on your stock cam as many have good blower cam characteristics and they'll pass smog,too! I also think porting your stock heads and good aftermarket intake should get you where you want to go.
With the 5.7" rod and stock stroke, you'll have a better ring-pack and more skirt. You won't miss the additional torque a stroker gets you as you'll still be able to haze 3rd gear and run 11s.
The trick is going to be getting enough belt wrap to drive the blower w/o slip to make 12-14# boost to get you in the HP ball park. See if anyone is offering an 8-rib conversion for your car (Blowerworks??).
That's just my two cents so take it for what it is worth.
Regards,
Chris
Last edited by Brand-X; Jan 16, 2008 at 08:18 PM.
