243 Heads
#1
243 Heads
Will 243 heads from the C5 Z06 mount on the 3.9" bore LS1 found in the 98-02 Camaro/Firebird? If so is there a substantial gain found in them over the 241 LS1 heads? I am looking at a set that are brand new LS6 heads (243 casting), Stage 1 ported by Livernois Motorsports. Assembled with stock LS6 valves, retainers and springs, stock chamber size. Any suggestions? Thanks. -Tom.
#2
Those heads were first introduced on 2001 LS6 engines, so yeah they will work on an LS1 (3.89" bore). You should see about 10-20 hp increase with stock 243 heads over 241 heads. With ported ones, you can see as much as 25-30.
#3
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i think 98 heads have a different bolt pattern. but 99-2002 should be fine. the positive with actual vette heads is they come with light weight sodium filled valves (not sure if both exhaust & intake). however right now one of our sponsors is running a special on ls6 heads (w steel valves). i believe stock 241 heads flow about 245 cfm, stock ls6 flow about 265. and ported heads flow over 300 plus.
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#11
The hollow stem valves only cam in a few select years. 02-04 I believe, but don't hold me to those years. The recent 243 heads have solid valves. I have a set of 243 Stage I's from Livernois and they have solid stock LS6 valves.
#12
Livernois is a great company with great customer service. I talk to Mike there whenever I call. He answers all my questions and he's as nice as can be. I highly suggest them. You won't be disappointed.
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I don't remember where I found that chart but its very helpful!
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It looks like the one from GMPP's performance catalog. I believe they have the flow numbers for thier different heads on there as well. The website that I know its on isn't a sponser here, so I won't post a link,but it should be available elsewhere too.