The 074 casting with the 077 exhaust ports are very sought after. The issue is the castings have porosity issues and crumble, leak at the studs that go into the intake runners.
The 077 snowflake is different, it is more like a medallion and is easily spotted
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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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