'66 ZL1 Corvette

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**olredalert** · #1 09-21-2015, 01:12 PM

----Well,,,I would guess that's because the add gives the part# of the GM ZL1......Bill S

**Carleen** · #2 09-21-2015, 01:42 PM

1966 Corvette Stingray Convertible

NEW 427 GM ZL-1 aluminum big block (part # 3946053) w/ new GM aluminum rectangular port heads, part # 12363401,

The newly ZL1 blocks 12370850 have Casting # 3946053

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