Hey guys. I was curious how much milling heads effects compression.

What information is needed to discover this?

The heads were milled .005 to clean things up when the rebuild went together.

Will this effect anything at all? I understand that it isn't a major amount but would it bump me from a stock 10.5-10.55/10.6ish?

Or is it even less of an effect than that.


Thanks guys.

 

Best thing to do would be to remeasure the combustion chamber cc's, and recalculate the compression ratio using the specifics for your engine. Were the heads cc'd before they were cut? There no guarantee that the stock heads had exactly 54cc chambers. They can vary a bit to begin with.

Ballpark, you're probably looking at about an 0.1 increase with the 0.005" cut