Originally posted by DrDirt
Might have been those 4 hotlaps at Sunshine with a 160* thermostat installed backwards. How hot did it get during those runs? Hot ECT with high loads and cold air = detonation = possible blown HG. 
Never got above 180. I never hot laped it. I got right back in line after a couple runs, but they stoped the street cars before I could hotlap it.
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-Vince