From the Federal-Mogul master engine bearing catalog:

Main bearing set #648M available in 10, 20, 30,40, and 60 undersize. Consists of one each of bearings numbered 1416SB, 1417SB, 1418CP, and 1419SB. Shim set # FSM 105S is required on 1948-53 engines.

TRW bearing set # MS1175A is the equivalent, in the same available undersizes. It contains bearing numbers MB1175, MB1176, MB1177P, and MB1535. The TRW shim set is #SM 105S. Have fun!

The conversion bearing sets for connecting rods machined for insert bearings are:

Federal-Mogul 1415SB-10
TRW CB503B-10

Undersizes for rods are 20, 30, 40, and 50.

Jerry


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