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Old 02-13-2020, 10:37 PM
RALLY RALLY is offline
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Default Chevy S.B. heads 3998993-factory installed in 72 Nova?
Did Chevy use two different cylinder head castings for a 72 Nova SS? Did they use the 3973487 heads used on the late 1971 build for a 1972 Nova or did they use 3998993 heads starting in January 1972 builds?
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