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I am sure and have some articles somewhere they never made a small block alloy head or at least one that worked and by the factory and if so you will never find one so it will be an aftermarket one which wont (presumably in the crazy world of FIA racing) be legal but who knows, the alloy heads didnt appear till the corvette engine in the 80's. although the made a factory Phase 6 alloy head that can fit my 3rd gen car in the 80's I believe GM homologated these and the car but never raced it. Also they had something called a Pontiac head that you may want to research. I seriously doubt the heads were homologated for the Camaro 1st gen but prepared to be proved wrong. In fact would like to be!!!
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