302/350hp SBC heads, 1st pics are 0f 3973370 Date code Jan.27, 1970 2.02/1.60 valves, factory GM Screw in rocker studs & guide plates Fresh Fully assembled $500. 2nd set of pics 3927186 Date Code Oct. 28, 1969 2.02/1.60 press in rocker studs Fresh fully assembled $500. The 370 head was most likely the warranty replacement for the original 186 head, these are a very nice bolt on ready #s matchin...
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