hand ported 243's, how do these look?
He just did a duplicate set of these for a STOCK CAM 6.0 GTO and they gained 20rwhp average and 30rwhp at peak without tuning.
I hope to have the flow sheet soon, still haven't got it from him.
I hope to have the flow sheet soon, still haven't got it from him.
The porting looks good. I do have a question though. Is there a difference between an LS6 #243 casting and the newer non-LS6 #243 castings? The reason I ask is because the combustion chamber on that head looks exactly like the one on my #241 castings. I thought that the chamber rework that GM did is what provided the improved performance over the other castings, as well as a slightly smaller chamber. It probably won't make a difference on a ported set of heads. Just curious if anyone has any more info.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
The porting looks good. I do have a question though. Is there a difference between an LS6 #243 casting and the newer non-LS6 #243 castings? The reason I ask is because the combustion chamber on that head looks exactly like the one on my #241 castings. I thought that the chamber rework that GM did is what provided the improved performance over the other castings, as well as a slightly smaller chamber. It probably won't make a difference on a ported set of heads. Just curious if anyone has any more info.
the 243s come from 3 different plants . 2 use a special process that leaves triangle marks between the spark plugs on the outside . . the other plant of the three, uses a sand cast . scroll down for a quick read :
http://209.85.215.104/search?q=cache...lnk&cd=1&gl=us
http://209.85.215.104/search?q=cache...lnk&cd=1&gl=us
Last edited by snake charmer; May 19, 2008 at 11:00 AM. Reason: typo
Heck he could have sent me the wrong pics, he sent these and the heads won't be to me till tomorrow so I'll get pics when I have the heads in my possession. Here's his link to some other stuff he has done.
http://www.coupeperformance.com/index.html
http://www.coupeperformance.com/index.html
They look good, but what do they flow? Also how big is the intake runner? They look kind of big, but you can't really tell just looking at a pic. The combustion chamber looks more like a 317 head (72cc chamber), along with the d-shaped exhaust ports.
But you don't want to remove material there if you want to try to keep the air from seperating off the short turn radius.