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These are the standard main bearings for the Formula Ford 1600 ("Kent/Cortina") engine. These bearings fit the standard 2.271" (57.69mm) bearing bore in the block. If your block has been line-bored to correct an alignment problem, you will need our .015" Oversize OD FF1600 Main Bearings(Part No.40-1504) Main bearings are sold in sets of 10 (one set completes one 4-cylinder engine).