Thread: Interesting GM Aluminum Heads Experimental/Prototype Big Block Chevy
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Old 10-09-2021, 01:59 AM
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What is the casting date of the 074 head? A part number starting in 0 is experimental. What is that date?
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1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
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