Replacement quality main bearing set for all A+ 998 small bore engines. The A+ engines used a center tang on the main caps rather than offset like pre-A+ engines. 
 
Avalible in STD, +.010, +.020, and +.030.
 
Note: It is common for the rear main oil galley to be partially overlapped by the bearing. We highly recommend chamfering either the block or bearing to allow for more oil flow. While on a standard application it is ok, your rods will benefit from the ability to recieve more oil- especially for competiton use.