ben husen

i have a ls1 bored to 3.905 was thinking ls9 gaskets but would like a lil more compression then they give

ls1 3.905 bore 4in stroke -7cc pistons piston sticks out .015 317 heads 72cc chamber when they block was at the shop they didnt put any special finish on it if they even milled it at all just told them to clean it up if needed heads arnt done yet so i can get them done any way was looking at the commetic .040 thick gasket over the ls9 .051 but heard u need almost a mirror finish for that gasket
thanks for any input shooting for around 10.5:1 boosted setup on e85

ben husen

125 looks and not one input?

02blksscmro

Here's some input only imo....from what I've read .040" is pretty ideal quench. With the pistons out of the hole .015" the ls9 gaskets look like the better option. They'll still put you at .036" vs the .025" with the cometics. I would do ls9 gaskets and not look back.

ben husen

ok i guess i wasnt really thinking of that i guess ill do that then only worth a few compression point anyways i guess

.boB

iTrader: (1)

IMO, the Cometic MLS gasket is the best on the market. It does need a better finish than most gaskets. But any decent machine shop should be able to handle that.

Never use the head gasket to adjust compression. The very small change in static compression won't gain you anything.

Use the gasket to set quench. That's where you can make huge gains in performance, efficiency, and longevity. All part of the blue printing process.