Specifically on a 103 motor? Just curious...

 

.3 so 10.2:1 would be 10.5:1 with .30 gasket.

 

thanks

 

If looking for more compression, best to use a piston or have the heads cc'd/surfaced.
As already mentioned, a gasket swap won't accomplish much.
Scott

 

That's just it... I'm not looking for anything, just curious at this point. If (when) I get the heads ported and polished, I'll get the heads shaved and put in the shorter gasket. Just curious how much additional is from the gasket.

So what I'm getting is... if the head is shaved and the .030 gasket installed, the stock pistons will be in the 10.5:1 range.

 

No, you got it wrong. If you just change the head gasket from stock to .030", static CR will be about 10:1, depending on actual chamber volume and deck height. Static CR will increase proportionately from there depending on how much the head is decked which reduces chamber volume. Another factor to consider is corrected compression and CCP which are functions of the timing of the intake valve timing. Static CR may be 10:1 but depending on cam selection, corrected compression could be in a manageable or unrideable range.

You should check out the BigBoyz compression calculator and become more familiar with everything that affects compression; it can make or break a build.

 

Thanks. It's all academic right now, but the calculator is a good resource.