[blykins]

WB, static compression is 10.5:1.

These are Probe pistons. Their catalog lists these pistons as fitting both inline and twisted wedge valves and having a 25cc dish. When I got them, I cc'd them and they were exactly 25cc's. However, after more inspection, I realized that they forgot to mill the eyebrow for the twisted intake valve. So I had to box them all back up and send them back.

At first I was planning to hit 10.7:1. The new eyebrow added a tad more volume, so my calculator shows I'm at 10.5.

These were the only pistons I could find off the shelf that would work with the 4.155" bore and the 4.100" stroke.