New Main Bearing Set??????????

[John Morris #23947]

My local napa gave me a new Federal Mogul main bearing set. It has penciled on 365-390-429 Cadillac. The part numbers are 993 M 30. But aren't there several different sets involved from 56-67? Would someone be able to Id this part number? Please?

[Philippe M. Ruel]

Crankshaft main bearings diameter is :
* 2-1/2" on 331
* 2-5/8" on 365 and early 390 (through 1962).
* 3" on late 390 (1963) and 429
* 3-1/4" on 472 and 500.

Rod bearings feature the same 2-1/4" diameter on 331, 365, 390 and 429.
472 and 500 rod bearings are 2-1/2" in diameter.

Hope this helps .

[Chris Conklin]

Here are the parts book pages. It probably won't help with the part number, but it shows the different offerings for the years.

[Dave Shepherd]

Rock Auto shows Clevites # ms411p, .010 under, 56-62.  What year is your engine?

[John Morris #23947]

Thanks fellows. I still gotta try and translate these part numbers.

[Warren Rauch]

 From Federal Mogul   main bearing sets
   810M is Cadillac 1949-55 331
   993M is Cadillac 1956-62 365,390
4419M is Cadillac 1963-67 390,427
  The 30 on the end of the number is a  .030 oversize bearing  for a .030 undersize crank. Warren

[John Morris #23947]

THANK YOU Warren! And to others who responded, many thanks too!