[FFR428]

I don't know the exact dome specs but with 73 cc heads your close to 14.0:1. The domes can be milled off if desired. They are thick enough. I was looking at a set of those a while back to use with tunnelport heads. Try over at FordFE.com. I'm sure someone there has the exact specs. I have it somewhere here also and I'll try to find it. If I had to guess you'd be around the 13.7 range with 76cc chambers. Yikes!