L 89 GM Rod and Main Bearings?

[Steve W.]

anyone know the GM part numbers for the Rod and Main Bearings, are they ok to use (any known issues with NOS originals?) Thanks, Steve

[Dick W.]

Re: L 89 GM Rod and Main Bearings?

I believe the originals were Moraine 400 tri metal bearings, the best on the market at that time. I would not be afraid to use them.

[Joe L.]

Re: L 89 GM Rod and Main Bearings?

I believe the originals were Moraine 400 tri metal bearings, the best on the market at that time. I would not be afraid to use them.

Dick------

The original big block bearings were Moraine 400. However, they were not tri-metal. They were premium aluminum.

Current GM bearings are also premium aluminum. However, they are manufactured by Federal Mogul. If one purchases the current GM bearings, they will be F-M in a GM box. You can get the same bearings in F-M packaging if you get their "AP" series bearings (much harder to find). From F-M,, they are available in sets; from GM only individual bearings.

By the way, I am definitely NOT a guy that believe that all OEM parts are the same as aftermarket if they're manufactured by the same company. However, in the case of these bearings, I believe they are the same.

By the way, I'm also a big believer in using premium aluminum rod and main bearings for street big blocks and small blocks, too.