Anyone running thinner than stock head gaskets?
 

I recently picked up a basic short block for my truck. I'm putting a baby cam in it and also wanted to bump the compression a bit so I bought some Cometic .040 head gaskets. However, after looking at the short block, I noticed that the pistons stick up out of the bore (I measured about .010 above the deck). That was a surprise to me and that leaves me with .030 clearance between the pistons and heads (pistons and valves have plenty of clearance).

Is .030 too tight? This is a truck motor that will not see crazy RPMs, nitrous, FI or anything like that.

I was hoping to pick up a little C/R since the new pistons have about 4cc's of valve reliefs cut into them. It looks like I'll have 9.78:1 with stock gaskets (.051) and 10.02:1 with the Cometics (.040).

Thoughts?

Personally I wouldn't go below .040 with a stock rotating assembly.

Its effectively the same thing as milling the heads 0.010" which is quite a bit. You will probably be fine but you can always check PTV clearance when you have a head on.

For PTV yes, for quench milling the heads doesn't change it. Or are you saying something different? Non the less .030 quench is really tight.

No, you are right, quench wouldnt change with milling. I agree 30 is tight, but if this really is a low-rpm, non-power adder deal then he should be fine.