[Peter D]

Pat, I had exactly your symptoms & Scott's analysis was right-on. The car ran fine during minor tests, but once we put it on the dyno for some sustained work over 3500rpm, things went south. We got very sudden rise in temp, & then it blew a hose at the back of the tunnel. We even got steam coming out of one of the exhaust pipes !

The net result was that engine builder #1 had put one of the head gaskets on back-to-front : blocking off the the rear block/head port. The huge temp spike on the dyno also caused a tiny gasket failure between the water port & the cyl - hence the steam !!

Definitely worth a check-out of the remaining gasket.

Kind Regards,

Peter D.