340 compression ratio

Couldn’t take it anymore. The pistons have some carbon in the tops of them so figure since I’m that deep, I may as well go ahead and pull them to clean the carbon off. I just pulled one of them today to see if I could get a part number. Looks like a silvolite 1267 .030, that should get me closer. I’ll try and get the heads cc’d this week.

Just put them at tdc and run a wire wheel in a drill to clean the carbon off... No need to pull the pistons and put another clamp cycle on the connecting rod nuts...