I recently built a new ej25 and had originally ordered clevite main and rod bearings. Installed the clevites in the block and rods to check clearances and they were all over the place, very inconsistent. Decided to order all acl race bearings. Main clearances specd out at with only .0003 variance, rods were all exactly .0021 clearance. 1300 miles later and they are doing perfect, no metal on my drain plug at the 1000 mile oil change. Also the mains I used were std, rods were hx's.