Seller notes

GM Performance Parts 19170540 502 Mark IV/Gen VI Bare Block• New design casting incorporating the best designs of Mark IV and Gen VI• Production-type cast-iron 4-bolt block• Improved main bearing bulkheads– Bowtie block-style bulkhead• Clearanced for bigger strokes• 4.470" finished bore• 4.500" max bore (siamese)• Fuel pump pad has been added/machined• New water jackets for use with Mark IV or Gen VI heads• Revised oiling to allow for bigger cam bearings/cam lift• Bolt boss...

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