Quote:
Originally Posted by BBF67
From the 2018 NHRA rulebook====NHRA-accepted aftermarket cylinder-heads carry a horsepower penalty that is calculated to the weight of the vehicle and does
not change the class of the vehicle.
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The BB Corvettes had an aluminum head option. Always been there and it stands by itself. The head that they use is a GM head OR a GM REPLACEMENT head not an AFTERMARKET head.