Not really, I know it is a pretty big chamfer though, plus the 4 valve reliefs they have also. Each valve pocket is going to be between 1 to 1-1/2 cc each plus i'd add an additional 6-8 cc's for the chamfer, so you'd be looking at a value of 10-14 cc's to factor into the compression ratio formula. I would expect to lose 1/2 a point minimum because of it.
