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1 The new Boss ’9 build began with a Ford Racing 460 cylinder block, PN M-6010-A460. It’s an updated version of the factory 385-series block that spawned the original Boss 429, which had four-bolt mains and a denser iron composition when compared to the standard 429/460 design. The Ford Racing block is designed for competition use, so it’s stronger than the original blocks, too, and comes with four-bolt mains. View Related Article
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