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 are Tri-Metal construction, for maximum durability and longevity. Tri-Metal construction has been well proven and used since the 1950's. First developed and sold under the "Michigan 77" brand name, they were later bought out by Clevite, and then by Mahle. Tri-Metal construction is a well proven and mature method of bearing construction. It consists of a steel backing, which provides the primary structural ridgidity for strength and proper press fit rigidity of the bearing shell. Then, an intermediate layer of copper-lead alloy is bonded to the steel backing in a "clad" process, where high explosives are detonated on top of the two sheets of metals. This actually bonds the two metals together on a molecular level. This middle copper-lead layer helps to carry the bulk of the engine's load. Some lead is also mixed into the copper which acts as a solid lubricant, and tin is also added in for extra strength.

Finally, a very thin layer of leaded bronze/babbitt is applied, which offers excellent embeddability for any small debris or particles which may get into the oil. This provides seizure resistance as well as additional strength and anti-friction properties.

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.)

Our CLEVITE H SERIES 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.)

The "V" series were originally manufactured by the Vandervell company in England, Clevite bought Vandervell and is now distributing their bearings under the Clevite name as the "V" series. We feel the "V" series are a great choice for performance bearings. "V" series have found their way into nearly every form of motorsports with virtually no problems. These bearings are still a tri metal bearing, however they use a lead indium overlay instead of the babitt in the above bearings. Lead Indium has amazing properties. It has a super low surface friction coefficient or lubricity, meaning wear at startup before the engine can develop oil pressure is greatly reduced. It can withstand and operate at higher temperatures for longer periods of time. It will resist flaking and peeling under extreme loads better than any other bearing. It has the highest resistance to corrosion of any bearing material, and it does all this while still having unsurpassed properties of embeddability, conformability and fatigue strength. And the best part is just because these perform so exceptionally in a racing environment, there is no reason they can't be used with equal success in a street car or in milder performance engines as well.

"RB" (413/426/440) Main Bearings / Size: STD / Series: V / Material: VP-3 / Oversized Fillet Champher: YES / Oil Groove: Half .150"