Need help cross-referencing bearing pt number.

[Mike67]

So I tore my motor down and am trying to order new mains and can't seem to locate this number any where on the web..
Clever MB1883M/ 1884M. Does anyone have a cross reference?
Thanks

 

[Lefty71]

383 main size?? M-series bearing....with the micro babbit layer.

Included in Main set 481-M, according to Mahle book.

 

[Mike67]

383 main size?? M-series bearing....with the micro babbit layer.

Included in Main set 481-M, according to Mahle book.

No sir its an RB the block is a 71.

 

[Lefty71]

No sir its an RB the block is a 71.

I see it now.... dunno why the book i saw said 383....maybe RB 383?? because it did say 59-60, so thats the same in any RB I would guess. Those are obsolete as a set, but must be superceeded I would think.

Clevite Engine Parts MS481M Clevite M-Series Main Bearings | Summit Racing

There's a description. any reason why you need M-series bearings?? they are babbit lined half groove. I think they are also narrower, maybe for filleted cranks????

 

[Mike67]

I see it now.... dunno why the book i saw said 383....maybe RB 383?? because it did say 59-60, so thats the same in any RB I would guess. Those are obsolete as a set, but must be superceeded I would think.

Clevite Engine Parts MS481M Clevite M-Series Main Bearings | Summit Racing

There's a description. any reason why you need M-series bearings?? they are babbit lined half groove. I think they are also narrower, maybe for filleted cranks????

Thanks, I bought the shortblock assembled. The crank must have been hell to balance judging by all of the metal removed and added, and it doesn't appear to have a radius.

 

[69Bee]

Yes, those are babbitt bearings and the width is normal, 0.949"/1.224", set PN# is MS481M as stated. The Tri-Metal set is MS877P, but has been superseded to MS2324P. For Federal Mogul sets, 4095M is the full groove set, and 4924M is the partial groove set.

 

[Mike67]

So I've read varying opinions on 1/2, 3/4 & full grooved bearings and could really extract an application for each...most was conjecture. Even the manufactures recommendations were pretty vague as to application. What is everyone running here?
From what I had found I was looking at running the 2324P, should I go ahead and get the 3/4 groove? Pump gas 550'ish hp street driven car.
Thanks

 

[69Bee]

Std oil pump for 1/2 to 3/4 groove, and hi-vol pump for full groove