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This ACL main bearing set is a +0.25 oversized kit specified for 1993–2002 Mazda 4 applications with the 1991cc FS engine. It provides the correct oversize main bearings required when rebuilding or re-boring the crank to factory-aligned clearances. The set is intended to restore proper bearing tolerances during an engine overhaul and supports reliable crankshaft support when installed to the specified oversize dimension.
ACL 93-02 Mazda 4 1991CC FS +.25 Oversized Main Bearing Set
