Performance Main Bearings STD - RB Engine - SMALL THRUST - Champhered - 3/4 Groove

Our performance series main bearings are plenty strong for those high powered stroker builds without sacrificing long term durability for lots of street miles. These have all the best features built into them. They feature a 3/4" oil groove, to ensure the most possible bearing load surface on the bottom of the bearing, which is where most of the load is carried. During operation, the engine is trying to "push" the crankshaft down and out of the bottom of the engine.

They are also already narrowed and/or champhered as required to clear the larger radius on aftermarket and stroker crankshafts.

These have the smaller thrust surface, which was originally designed for 1973 and earlier RB engine blocks, but will fit RB engine blocks of all years.

These are Standard size for 2.750" main journals (RB Engine.)