LS1TECH - Camaro and Firebird Forum Discussion

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- - How much can u mill 853's (https://ls1tech.com/forums/generation-iii-internal-engine/952878-how-much-can-u-mill-853s.html)

95FbFormula

Jul 12, 2008 11:22 AM

How much can u mill 853's

I have a 6.0 lq4 using stock replacement pistons 4.010 bore looking to get as much compression as I can out of it with 853 heads.

Shawn MacAnanny

Jul 12, 2008 05:46 PM

.030 i believe. I'm pretty sure you need to use 3.905 gaskets and not 4.010 too.

chpmnsws6

Jul 12, 2008 08:13 PM

I pulled .050 without any ill effects

camaro 1999

Jul 13, 2008 02:02 AM

i bought a car and the ad when i bought it said that the car has stage two heads on it but the casting on the front say 853 can i check this somehow?

quikrnmost

Jul 13, 2008 02:16 AM

.050 is as far as I would take it. I know .035 on mine is fine.

cdoggy81

Jul 13, 2008 11:16 AM

chpmnsws6,
Did you have to mill the intake any to get it to fit ok?
Shorter PR too I assume.

chpmnsws6

Jul 13, 2008 12:32 PM

Didn't have to angle mill it, and yes, I ended up with a 7.350 PR

cdoggy81

Jul 13, 2008 09:10 PM

Cool, that's what I did with my 241's :)

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