Out of the race bearings of these two companies, what do you suggest i should buy for my b16a2 which should produce 400whp and RPMs over 8000.

 

they both are very good. ACL bearings are made in Australia and Clevite (now owned by Mahle) in the U.S.A. i have used them both, and they always work fine. they both are always very consistent in their tolerances. i think you will be fine with which ever you choose. good luck with the build!