affects of decrease combustion chamber by 6cc

[Todd440]

Sorry about that!  I was using the iPad, and couldn't find the proper symbols.  Once you do it a few times, you can do it on a calculator in less than 30 seconds. 
So, if you have a flat top KB, probably the 237 piston , and zero deck, you'd be 10.32  to 1 with 84cc heads, and 10.92 with the 78cc TF heads.  That's assuming you have a composite head gasket at .039 thick, which most are. 
Also, never assume the advertised CC's of products.  You'll find they are all over the board. 

[GreenFish]

Sorry about that!  I was using the iPad, and couldn't find the proper symbols.  Once you do it a few times, you can do it on a calculator in less than 30 seconds. 
So, if you have a flat top KB, probably the 237 piston , and zero deck, you'd be 10.32  to 1 with 84cc heads, and 10.92 with the 78cc TF heads.  That's assuming you have a composite head gasket at .039 thick, which most are. 
Also, never assume the advertised CC's of products.  You'll find they are all over the board.

   Thanks man, That's about what I was thinking in my head. Not that big of a difference. I could even go with a thicker head gasket if 10.92 is too high i suppose.

[Chryco Psycho]

Quench is more important than compression so stay with .040 gaskets [ I would use Cometic with alum heads ] & 10.9 compression should work great

[GreenFish]

Quench is more important than compression so stay with .040 gaskets [ I would use Cometic with alum heads ] & 10.9 compression should work great

Cool, thanks