95civic2005

iTrader: (8)

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

95civic2005

iTrader: (8)

Come on fellas! I need someone who knows more about head than I do, which doesn't take much . Or just some opinions on the situation.

98SSClone

iTrader: (2)

Get your heads milled, and port your intake and TB and you should be pretty damn close to your 460hp mark.

95civic2005

iTrader: (8)

Thanks for the reply! For whatever reason I hadnt thought about porting the intake an TB.

A.R. Shale Targa

iTrader: (2)

Wack em' .030 = 10.6 : 1

95civic2005

iTrader: (8)

You wouldn't go more than that? I was told something around 11.1 to 1.

A.R. Shale Targa

iTrader: (2)

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.

itsslow98

iTrader: (18)

He has Forged Mahle Pistons(-4cc reliefs) so he shouldnt have to remove anymore i would guess.

94 s dime

iTrader: (10)

Mill em! id go as far as you can and use some E-85!

95civic2005

iTrader: (8)

MIght do it over the winter, still not sure. E-85, I'm not sure where the nearest place to buy that is. When you gonna sell me that nitrous kit???

A.R. Shale Targa

iTrader: (2)

My bad.....sorry I missed that; a half point bump in comp. certainly won't
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.

garygnu

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.

94 s dime

iTrader: (10)

what work does e85 need thats to hard for that car? a set of injectors? thats the cam geoff spec'd for the combo on the car it needs a bump in compression or better cyl heads in general