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I don't know of any different casting numbers on the block, it's a standard corvette 4 blot main LT1 block with upgraded internals. The LT4 engine used in the Grandsports corvette used a different tensioner, but other then the red intake and valve covers nothing else external is different. The LT4 heads are part # 12555332.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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