bobfig

well i have a 2005 5.3l with castech heads that decided to start leaking. im about to pick up some 799 heads and was wanting to get my ducks in a row on ordering parts. i know i should mill the 799 so the chamber is around 60-61cc. from what i read thats milling off .025-.03" off.

im trying to figure out my compression ratio and what it would take to achieve possibly a 10 to 1 compression.

right now im looking at the ls1 mls head gaskets (12498544) with a .051 compressed thickness.

the block has never been touched as far as i know.

i have put all the specs i know into calculators and they keep coming up with different results. basically anywhere from 9.85-10.43 to 1.


my truck cant be down for more then a weekend. i may be able to swing it but really don't want to. if it has to i would rather just go with a proven set up then chase numbers.

bobfig

Well i picked up the 799 heads and had them milled supposedly 0.027" to make it around a 59.5cc chamber. Going to messure them in a little bit. Should make the static compression around 9.8 to 1 with a stock 0.051" gasket. More to come when i slowly gather parts.

Any input would be highly welcomed

gagliano7

I was told on my 2004 5.3 with 58cc heads I should be at 10:1. This is according to TSP.

bobfig

thanks,

heres a few calculations. it should be a 59cc for the 10:1. i just ordered all the stuff i think i need other then the push rods as i need to measure for those. ether way i should be happy where the numbers sit now.

gagliano7

Is that calculator online?

bobfig

thats two of them and yes

Bowling's Compression Ratio Computation

Engine Compression Ratio (CR) Calculator

gagliano7

Thanks