To be honest, I am not absolutely certain what is under the hood. The bottom end and the cam are the biggest question marks. The seller emphasized the 2.02 heads and the cam more than anything (and I feel pretty certain the cam was changed). I guess he was never clear what was really done to the bottom end other than saying it had been redone. I never thought about a bore to 340 not being possible. The compression is fine in the car--around 10:1. So I guess I really don't know what the heck I have, but it is damn sure fun to drive, particularly the higher into the RPM range it goes.