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They are heavy casted, smog chambered (76cc) 1.94 1.50 valve heads with I believe 160cc runners. If your building a stock or close to stock street runner, with a little bowl porting they`ll work fine, but limited for the upper horsepower class. They also came in the 487X casting, which has a 5cc bigger runner.
 

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They were used on the LT-1s of the early '70s.
 
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