I have a set of these laying around and I was wondering if they were worth doing anything with. According to what I've found out these were the heads used on the later LT-1's.

Are these any good, or should I use them to block the wheels when the parking brake goes out of the lawn tractor?

 

462624 castings are very thin walled castings. They are not designed for high performance applications. The exhaust seats will crack very easily if the engine gets too hot. (no nitrous, no turbo, no supercharger use)

These heads are 76cc open chambers. The were available with small and large valves. When available with large valves, they also came with screw in studs and guide plates. Intake port volume is only 160.

For what it would cost to rebuild these 30 year old heads, you'd be better off buying a set of Dart heads.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car and knocking on the SuperPro ET class
383 stroker (carbed) with double hump cast iron heads and pump gas
LS6 Big Block buildup now in progress

Best results before the engine blew up
Best ET on a time slip: 11.857
Best corrected ET: 11.163
Best MPH on a time slip: 117.87
Best corrected MPH: 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!

Member of the Calgary Drag Racing Association

 

Okay- no biggie since I didn't pay anything for these