derek_silvy

I have from time to time thought of getting some take-off LS6 heads when I have the money (after my new rear end and slicks).... because I think they'ld be pretty cheap. I was wondering what the volume of the combustion chamber is on LS6 heads and what they are on stock LM7 (5.3) heads. The LS6 heads make a 9.5 c/r on a stock motor, so I was wondering what LS6 heads would do to that?

Also... isn't there work that can be done to raise the C/R.... I'm not talking about milling.... I've heard of some procedure (if I was listening right) where new metal is beaded into the combustion chamber and smoothed out.

derek_silvy

Cool, thanks for the info

Maybe I should streamline my questions here:

You have now established that the LS6 heads have 64cc chambers

What is the volume (in cc) of the combustion chambers on stock 5.3L heads?

What compression ratio will the LS6 heads make on a 5.3L?

Thank you,
Derek

jrp

iTrader: (16)

you will loose compression with the ls6 heads. 5.3 chambers are ~61cc. stock compression on the 5.3 is 9.4, the pistons are dished ~6.5cc if i remember right.

WinMan

iTrader: (4)

i thought 5.3s were 59cc

jrp

iTrader: (16)

there 61.15. the only ls1 head from GM with a sub 60cc chamber is the c5r.