I will have to look at my notes when I get to the shop today. The compression ended up being 12.2-12.3. I used a PAC spring that Jones recommended. I will look at the notes. I am going to indy show today, so it will be later. The hardest part of my build was getting the springs right. A lot of trial and error. The valves aren't long enough IMO.

I would love to see north of 14-1 compression in mine. Maybe next refresh we will have some dome pistons made. Interesting note: with the old cam I used to run 36 degrees total timing. With the new cam on the dyno power fell off at anything over 33. I never tried any other timing at the track. Just left it at 33.

Peter Wille has a YouTube video of his VIctor head 555" cranking out 1000HP. Hard to believe.