kpforce1

iTrader: (9)

I figured I would raise the compression a bit for the cam to squeeze some more power out. Here is what I have:

Stock rotating assembly (new oil pump and LS2 timing chain though)
Frutal F11 228/230 .577/.595" ona 114 LSA
Comp 918's
Morel Lifters
Hardened pushrods (don't know what length yet)
1 7/8 Kooks race headers with dual 3" exhaust and X-pipe
SVO 30" injectors
Ported TB
Z06 MAF
Cometic .040" gaskets

With everything I have listed I think milling the heads to get ~11:1 CR would be alright. Any thoughts? How much would I need to take off of a stock 99 LS1 set of heads to get the compression to 11:1 with the .040" Cometic gaskets? I was thinking around .020" because I think the Cometic's take the CR to around 10.5:1. Will there be any issues with intake alignment, piston to valve, etc. etc.? Thanks in advance.

Scott

conundrum07

iTrader: (20)

Each .006 removed is worth 1cc in the head. With the .040 you would need a 63cc head which is ~.022 milled. You will definately want to check your p2v clearnace when you put it back together.

GuitsBoy

iTrader: (4)

Yeah, definately check P to V. If youve got adequate clearance when you mock it up, then have the heads decked. Infact, you may be able to go even higher compression.

braap

iTrader: (4)

Not to hijack, but what's the limit for milling stock heads before intake alignment issues become a problem?

GuitsBoy

iTrader: (4)

.050 seems to be the rule of thumb.

kpforce1

iTrader: (9)

Does anyone "think" I will have piston to valve clearance issues if I mill the stock heads ~.025", use the .040" gaskets, and the cam I listed in my first post? Just a guess if I'll have problems... I will be checking though.