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The Ford Racing Boss 5.0L modular cast-iron block is a competition-grade casting with a 94mm cylinder bore and a 4.6L deck height. The proprietary iron mix aims to maximize casting strength and consistency; bores are rough-honed and the deck is not finish-milled, so machine work is required before assembly. This block is intended for competition use and requires appropriate preparation and mounting adapters for certain Mustang installations.
Ford Racing 5.0L Cast Iron Modular BOSS Cylinder Block
