geeves

I am wondering what is best. Milling the heads 0.015 or going with a cosmetic gasket. I need to get to 9.0 compression for the cam I bought, but using the Felpro gasket doesn't get me there. I can get a thinner head gasket or I can mill the heads. What are the positives and negatives of each? Also wondering if milling the heads with create problems with the 3711 intake I plan to use. I read somewhere that you should mill the heads 0.015 to use that intake but I can't find that information again. Thanks

rustyroger

Milling the heads means the inlet ports are slightly off position, and you can't put the metal back. I don't know what you have done to the rest of the engine, but the best way to increase c.r. is a change of pistons.

Roger.

Gerald Nickels

I have milled Olds heads .060 no problem and Fel-Pro makes a thin head gasket too. My brothers Olds heads are milled to the numbers almost off and still runs great. Well the intake was cut too.
Gerald

olds 307 and 403

Do you have the part number for that thin Fepro head gasket? Milling that amount won't cause problems. I assume this is like mine, a mid 70's short block with early heads. The heads need CCd along with where the pistons sit in the hole, which is usually .025 to .030" for a factory built short block.