Last Friday night, I made a couple of passes, and after the 2nd, I got in the car after about 20 minutes of cooldown, and on startup I was on 3 cylinders with lots of steam out the tailpipe. I had no other way home, so off I went, after about an 1/8th mile it picked up the 4th cylinder and ran fine the 50 miles home. Temp was rock solid and the car never missed a beat. The next morning I checked the oil, looked fine on level and color, and the car cranked up and ran fine. The engine is a b-17 with studs and a holsett hx35 on 15psi and race gas. On the last pass the afr was 12.0 at wot. I really don't think it's the head gasket because it doesn't push any water out on a pass, but is there any other way to get water in a cylinder? I had the car miss on startup after a pass at Motgomery 11-09-2008 but no big steam out the exhaust, you could smell anti-freeze but no steam. The car ran fine on the next pass and has made several passes since then with no problem until now.
Any ideas would be greatly appreciated.

 

Sounds like the head is lifting to me.