any hp gain?
Thread Starter
Instructor
Joined: Jul 2007
Posts: 115
Likes: 0
any hp gain?
Im rebuilding my 85 engine, and Im leaving it stock, with the exception of the heads. I have a set of world s/r torquers that Id like to put on.
Anyone have an idea what kind of difference these heads would make hp wise?
Anyone have an idea what kind of difference these heads would make hp wise?
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
You likely won't notice any HP gain unless they have smaller cc and will raise your compression ratio. FYI - "s/r" stands for "stock replacement". A buddy of mine put a set on his '77, and there was no noticeable difference.
While you have the engine torn down enough to swap heads, it's not that much more work to swap your cam out. You'll get more punch from going to a larger cam.
While you have the engine torn down enough to swap heads, it's not that much more work to swap your cam out. You'll get more punch from going to a larger cam.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
You likely won't notice any HP gain unless they have smaller cc and will raise your compression ratio. FYI - "s/r" stands for "stock replacement". A buddy of mine put a set on his '77, and there was no noticeable difference.
While you have the engine torn down enough to swap heads, it's not that much more work to swap your cam out. You'll get more punch from going to a larger cam.
While you have the engine torn down enough to swap heads, it's not that much more work to swap your cam out. You'll get more punch from going to a larger cam.
A cam will really help, plus any head and intake porting you can do while it's apart will help some too.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
If you leave it stock, you will see minor HP gains. The stock intake, runners, plenum and exhaust are the bottlenecks on the L98. Change out these and the head capabilities will start to be realized. The heads are not the best, but better than stock.
Have fun with your project.
Have fun with your project.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
your oem iron heads are 76cc+...s/r tork heads come in both 67 and 76 cc version.
for cheap thrills, find a set of 77-79 305, or 84-85 HO camaro 305, heads
Last edited by redrose; Dec 30, 2007 at 01:36 PM.
Instructor
Joined: Apr 2007
Posts: 127
Likes: 0
Larger valve size with stock lift can cause a power loss. The larger valve is shaded by the side of the combustion chamber. This can depend on how much largerthe valves are. A 2.02 will not start to flow better until the lift is over 1/2 inch.
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