View Poll Results: Best head / intake combo for a 427ci FI build
LS7 / LS7
16
69.57%
CNC ported L92 / L76
6
26.09%
CNC 225cc LS1 / FAST
1
4.35%
Other
0
0%
Voters: 23. You may not vote on this poll
Best head / intake combo for 427ci FI build
Thread Starter
On The Tree
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From: Texas / 427ci F1R 1,002 rwhp/928 rwtq
Best head / intake combo for 427ci FI build Looking for recommendations on a head / intake combo on a 427ci FI build. I am considering Livernois L92's, ETP LS7's, Katech prepped LS7's or AFR 225's with a FAST intake.
Last edited by john_sblendorio; Apr 8, 2007 at 03:34 PM.
Staging Lane
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From: KS
I'll be going with either the ETP heads, or Texas Speed I think is supposed to have some LS7 prepped heads soon that are supposed to flow 407cfm on the intake side. Might wanna check around on those as well.
On The Tree
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Originally Posted by john_sblendorio
Looking for recommendations on a head / intake combo on a 427ci FI build. I am considering Livernois L92's, ETP LS7's, Katech prepped LS7's or AFR 225's with a FAST intake.
I just dyno'd my car with the l92 stuff.. It seems to work for me and It was way cheap compared to other options.
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From: Texas / 427ci F1R 1,002 rwhp/928 rwtq
That is great news, because I would like to get some of the package now and do it in stages. I can run the L92's with my 6L, then add the blower, then build a forged engine and add the 8 rib pulley kit and a better fuel system. The only problem is A&A does not think I can run a Ysi on the stock engine because it will make too much boost. I would rather not have to change out the head unit and waste $$ if I don' have to.
Staging Lane
Joined: Aug 2006
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A word to the wise regarding forced induction on the stock rotating assemblies for the C6 and the Z06 and the stock Ls1's. Take the time to at minimum put in forged pistons with proper ring gap. N/A cars are set up with ring end gap to tight and after prolonged periods of higher cylinder pressure which creates heat; ring ends expand and meet; ring eventually pulls the ring lands out of the piston. I have seen at least 8-10 of the exact same situation over the last 6 months. Take the time to do it right the first time. Build a solid rotating assembly set up for boosted applications. This site has many good engine builders who can help you out. Good luck.
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If you are doing forced induction flow isn't as important as it is being n/a. I would get some heads with the thickest deck possible. Production LS7 heads aren't as thick as ETP LS7 heads, AFR's, etc.
Consider that fact that out of the box AFR 225's with LS6 intake, on a 364ci motor (LS2 block, stock LS1 crank, good rods/pistons), and big single turbo have made 1000rwhp+ reliably..... These heads flow in the 330cfm range I believe.
Buick GN heads ported only flow around 210cfm; however with a big turbo and lots of boost people are squeezing 700hp+ from them. Just something to ponder.
How much power do you plan on making? Won't the transaxle in your Vette truly limit the ability to put the power down?
Consider that fact that out of the box AFR 225's with LS6 intake, on a 364ci motor (LS2 block, stock LS1 crank, good rods/pistons), and big single turbo have made 1000rwhp+ reliably..... These heads flow in the 330cfm range I believe.
Buick GN heads ported only flow around 210cfm; however with a big turbo and lots of boost people are squeezing 700hp+ from them. Just something to ponder.
How much power do you plan on making? Won't the transaxle in your Vette truly limit the ability to put the power down?
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