Your head gasket choice should be based on the type of heads and compression ratio you are using. Contact technical assistance at a parts supplier or parts manufacturer for your specific application.
They only make 1 size head gasket. It don't matter if it is 10 20 30 40 or 60 over the factory head gasket will fit with no PROBLEM.
Chevy 350 engines are bored to a 4 inch bore.
a 357 Chevy is a just a smallblock 350 Chevy bored .040 over for a total CID of 357, just as one bored .030 is a 355 Chevy. a standard rebuilt 350 is generally bored out during the rebuild process to usually 355, sometimes 357. right now i have a 357 Chevy in my 1970 chevelle
How much hp should I get out of my Chevy 350 bored .040 with six inch rods shaved block and heads. I'm running a 500 500 lift cam with 106 degrees of lobe separation
355
As much as your wallet can afford.
a 406 is a 400 bored .30 over
413
460
4.310
333
357