keith102371

iTrader: (20)

what would be the compression ratio with a stock 2000 ls1 bottom end with a set of 241 heads that are cut .025?

batboy

iTrader: (6)

Subtract 4cc from the combustion chambers which is about a .5 point increase in CR.

keith102371

iTrader: (20)

stock CR with 241s was 10.25 to 1 so that would make it about 10.75 to 1 right?

batboy

iTrader: (6)

Sounds about right, assuming you use GM gaskets and everything else is the same.

A.R. Shale Targa

iTrader: (2)

Factory LS1 is 10.19...LS6 is 10.45
241 chamber volume is 66.67 cc
243 chamber volume is 64.45 cc
I believe 6.7 thousandths of mill equals 1 cc of volume reduction
I wacked my 241s .030 and figured to be @ 62.2 cc for 10.75 with GM mls

keith102371

iTrader: (20)

what about with the cosmetic head gasket?

A.R. Shale Targa

iTrader: (2)

Depending on the cam size (less than 230 IN.) some will run the .040"
Cometic gasket which puts the quench @ an ultra tight .032" and will raise
the compression another .35 to one. But some end up flycutting for PTV
clearance which negates the squeeze increase.