Help figuring out my head/cam combo
Help figuring out my head/cam combo I need some help trying to figure out what to do about my heads! They are PRC LS6 stage 1 not milled. I am confused on what to do, but I am not really trying to spend a boat load more money. When the motor was put back together the compression ratio is fairly low. I believe it is 9.9 to 1 or 10.0 to 1. The car dynoed 438hp with the below mods and I am wanting a little more on motor before I spray it. Can anyone tell me what they would do if it was there car? Mill the heads how much? Buy 5.3 heads? Or?
I am leaning more towards just milling the heads down but not sure how much. And I know that will be the cheapest route and I don't believe anything wrong with that plan. I would love 460hp out of the combo with just milling the heads but I think that is a little much to ask for, right?
MODS
Forged Mahle Pistons(-4cc reliefs)
EPS 234/246 111lsa
TEA Valve Springs
TEA hardened pushrods
PRC stage 1 LS6 Heads
Fast 90/90
I am leaning more towards just milling the heads down but not sure how much. And I know that will be the cheapest route and I don't believe anything wrong with that plan. I would love 460hp out of the combo with just milling the heads but I think that is a little much to ask for, right?
MODS
Forged Mahle Pistons(-4cc reliefs)
EPS 234/246 111lsa
TEA Valve Springs
TEA hardened pushrods
PRC stage 1 LS6 Heads
Fast 90/90
Last edited by 95civic2005; Jul 24, 2011 at 09:49 AM.
Some have cut .045 off stock heads but then you might need to flycut the
pistons which defeats raising the compression. Aftermarket TrickFlow heads
with a 13 deg. valve angle helps sneak a larger cam in w/o flycutting.
pistons which defeats raising the compression. Aftermarket TrickFlow heads
with a 13 deg. valve angle helps sneak a larger cam in w/o flycutting.
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He has Forged Mahle Pistons(-4cc reliefs) so he shouldnt have to remove anymore i would guess.
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get the 22 rwhp that he's after and it would be a fair amount of work when
he could just up the pill by .010 more and WALLAH..artificial cylinder pressure
Leaving the static comp a tad low does offer a safety margin for NOS.
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
Likes: 4
mill the heads ,ask Geoff at EPS how much.ask geoff what head gasket to use.don't port a fast TB.maybe try to port match the intake to the head,align the head/intake port floor closely which mite require different intake gasket thickness.E85 requires too much work for a little gain NA,it works great with boosted.you don't want to mill you heads too much or you cam won't clear.
