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The Ford Racing BOSS 302 Big Bore block is a heavy-duty small-block replacement machined for larger bores and simpler big-displacement builds. With an unfinished bore around 4.120 inches, the Big Bore version supports engine sizes up to 363 cubic inches and retains compatibility with many original 302/351 features. Cast and machined in the USA, it simplifies the path to larger small-block projects while preserving core mounting locations.
Ford Racing BOSS 302 Cylinder Block Big Bore
