This ACL oversized main bearing set is specified for 1981–1998 Mazda 4-cylinder engines (B5/B6/BP family) and is sized +0.25mm. Intended for engines machined to the oversized specification, the set restores correct main clearances after line-boring or crank grinding. The bearings provide a direct replacement solution for rebuilds where the block and journal sizes require the specified oversize mating.

ACL 81-98 Mazda 4 1498-1597-1840cc B5/B6/BP .25mm Oversized Main Bearing Set