My cam selection

[jn2630]

Ok, my block is bored .030 over, I have 4.2 Crank, and rods, Stock 4.0 pistons dished to 20cc, .051 head gasket, and .03 deck clearance. I ran all this into the CR calculator, with a Comp Cams 68-115-4 (which I have already), I came up with a Static compression ratio of 9.1, and a Dynamic Compression ratio of 8.29, and a Quench height of .081. With a Stock Melling MC809 Cam (which I also have) I ran it through as 1999-2004 cam and I came up with a 7.54 Dynamic Compression Ratio. Will I be able to run 87 octane gas with the comp cams? If not, what octane, and are the benefits justifiable? Will I be limiting my power that much with a stock cam? I am also concerned with durability, will the Comp Cam last?

[Bodo]

The quench is a little high. This will also effect your octane need.

[jn2630]

Isn't there a thinner gasket available?

[Muad'Dib]

There are many gaskets available that are thinner.. however, decking the block will help the most with quench.