Head gasket Thickness

[keithmenard]

With my piston/ head combination (my engine: 468 chevy (TRW L2377 .60 over pistons). the heads: Aluminum GM Bowtie rectangular port heads # 14044861. These heads have 380 CC runners. They are 106 CC open chambers. They have been angle milled .125. The valve sizes are 2.25 / 1.88
What thickness in a cometic gasket would you run? I would like to be at about 8lbs of boost, and don't want to be pinging or blowing gaskets. I will prob be running 92 octane.

[Fiat48]

That's about 8.5 to 1 with a .040 gasket. So since you only run 8 lbs of boost I see no need for a thick head gasket. Remember gasket bore size plays a part in compression also. So a .040 or a .050 ought to do it.

[keithmenard]

thats about what I figured too...I just really haven't been able to figure out what the angle milling does to the compression ratio, or if that is just figured in to the cc's...any answers on that would be great!

[Fiat48]

It's all about cc's. Angle milling is just a way of getting more material off the chamber side.

[keithmenard]

I think I am going to go with those cometic .051, I think that brings the ratio to about 8 to 1. It should be pretty safe on pump gas and low altitude.
Just ordered all my studs and gaskets other than the head gaskets.

[Fiat48]

Again..it will depend on gasket bore size. Few gaskets are actual bore size.