Thanks for the reply Richard.It has been doing it since i put the Blower on.Bought it as a complete unit had been running on a mild 400ci in a 57 Chevy which was occassionnally dragged.Come to think of it it may be running lean,i remember now he ended up melting a couple of pistons...OOOOO scary.Could the leaning out be caused by a vaccuum leak?

Cheers Daryl