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Factory 4 bolt main engine block. Block casting number 3955270. Casting date I 25 8. Bored .030 over. Cylinders have some staining as shown with no ridge on the top. Some would use this as is and others would have it bored. The bores will definitely clean at .060 or less. Brand: Corvette Camaro Chevelle Nova Yenko COPO BBC 1968 Other Part Number: SCCA Trans AM Baldwin Motion Impala Biscayne L-8...