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Description
Reproduction of the original ‘621 I" bellhousing for various 1964-83 Chevrolet models with Muncie M-20, M-21, M-22, Saginaw, Borg Warner T-10 Transmissions. For big block or small block engines equipped with an 11" clutch. Original GM part number # 3899621. Accepts Saginaw, Muncie, Borg-Warner and Tremec TKO/T56 transmissions with a 4-11/16" pilot bore. Fits up to I" clutch on a 168 tooth flywheel. Also fits 153 tooth flywheel when used inconjunction with the proper starter.