The ACL Race Series standard-size main bearing set for BMC Mini inline-4 (from 1983 onward) is described as a high-performance replacement bearing kit in standard size. Intended for that engine family, the set supplies the main bearings used to support the crankshaft during rebuilds or engine service on qualifying Mini inline-4 applications starting in 1983 and later as indicated.
ACL BMC Mini Inline 4 (from 1983 up) Standard Size High Performance Main Bearing Set