360 build problem

[mentally_challenger]

im buildin my first engine for my 70 challenger. Its a .040 over 360 thats had the stock bottem end balanced. the pistons are hypereutectic and are 9:8.1 with my stock heads with 70cc chambers, i bought edelbrock 6079 heads with 65cc chambers. how much of a compression raise will this be?

[Chryco Psycho]

http://www.csgnetwork.com/compcalc.html

 Welcome BTW

[Rob C]

A minor increase. Not a stupid newbie question. A very good one to honest.

[dimples]

Are the pistons flat tops, and included in the raise? Or were the heads put on after the new pistons ran on the old heads.
Just asking.
If I remember, the Dish going away is like a half of a point, about................

[mentally_challenger]

thanks for the quick replys, the pistons are dish and are 9:8.1 with the cast heads, with the aluminum heads and the iron block i wonder about kinda of  head gasket should i run?

[Chryco Psycho]

no choice you need Cometic gaskets , unless you enjoy changing head gaskets ?

[dimples]

Agree, the composite Fel-Pro ones always blow out between the cylinders for me...................

[Rob C]

Never a problem with the Fel-Pros, but I'll not argue with the use of a Cometic.

[dimples]

I shouldn't have said always, LOL. But it is on the 318's, and not the 360's. I almost wonder if it has something to do with the smaller bore........(sealing ring being farther from the cylinder?)
Who knows.