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LS Conrod Bearings ACL Race Series Narrowed Shells (8B663HN-STD)
This set contains narrowed shells, suitable for aftermarket crankshafts with extra large fillet radii. The shell width has been reduced to a maximum of 20.1mm or 0.791''.
ACL RACE Series Performance Engine Brearings with a "HN" suffix feature a narrowed bearing shell which allows for additional edge clearance when running with crankshafts with exceptionally large fillet radii.
ACL recommends that full width bearing shells (with H or HX suffixes) are used in all other circumstances.