Spitting oil through tailpipes.

Ironmike said
Leaked it early in the spring and all was fine +- 3%. The thing I keep forgetting is the fact this thing has had 3 dyno sessions, Hughes heads, then Bloomers , then the current ones. That's at least 30 dyno pulls and I drove it hard all summer.

I don't like what I'm thinking. But again, I have over 250 pounds on the seat. Hard to believe 10 or 20 pounds would leak past the valves.

if the springs are "square" and the valve faces and seats are absolutely true, then yeah, I agree you shouldn't leak past that kind of seat pressure. I'm thinking your air pressure leakage would more likely occur at the guide. Did you listen for the leakage to determine the source?