ques on ls6 heads
Racer
Joined: Oct 2007
Posts: 380
Likes: 0
From: Knoxville Tennessee
20vette, the 241's flow pretty well compared to the older 853 (like what came on my 1997). The 243's have slightly higher compression than the 241's, but with careful head gasket and cam selection, you can probably get very similar performance out of your 241's that you would with the 243's. Ex, a friend had a Magic Stick 3, Ls6 intake, LG Street LT's, and stock 241's put down 430rwhp in his 2000 MN6 C5. I have a 228/232 (milder grind than the MS3), Texas Speed ported 243's, LS6 intake, and LG Street LT's and I put down 412rwhp/394tq. We were on different dynos, but the point is that he still put down great hp/tq #'s without investing $1000+ into heads.
MFIC
Joined: Aug 2005
Posts: 1,997
Likes: 14
From: Charlotte, North Carolina
Burning Brakes
Joined: May 2008
Posts: 1,147
Likes: 1
From: Mohegan Lake New York
Porting is a fine art. Some 243s have high flow numbers at .400, .500 and .600 lift, but poor air flow at .200 and .300 lift.
Some heads have great flow at .200, .300 and .400 and OK flow at .500 and .600 lift.
If you want SOTP, push yourself deep into your seat on take off, lots of under the curve torque, pick heads that have great flow at the .200 to.500 lift. If you want great HP numbers for bench, bar or forum racing, pic a high flow .500 and .600 lift and are big arz cam.
What it really comes down to IMO, figure out want you want your car to do? Drag race, weekend cruzer, DD, road race / track days or what ever.
Find and talk to a highly respected engine builder and tell them your needs. Have a budget, ( then double it) and let the engine builder do his magic.
Some heads have great flow at .200, .300 and .400 and OK flow at .500 and .600 lift.
If you want SOTP, push yourself deep into your seat on take off, lots of under the curve torque, pick heads that have great flow at the .200 to.500 lift. If you want great HP numbers for bench, bar or forum racing, pic a high flow .500 and .600 lift and are big arz cam.
What it really comes down to IMO, figure out want you want your car to do? Drag race, weekend cruzer, DD, road race / track days or what ever.
Find and talk to a highly respected engine builder and tell them your needs. Have a budget, ( then double it) and let the engine builder do his magic.
Intermediate
Joined: Feb 2005
Posts: 32
Likes: 0
From: Gainesville Fl
