There are 4 different main bearing diameters on this engine.

Crankshaft diameter (standard size)
#1: 2.6835/2.6845"
#2: 2.7145/2.7155
#3: 2.7455/2.7465 (thrust bearing)
#4: 2.7765/2.7775

Oil clearance:
#1: .0005/.0033"
#2: .0005/.0033"
#3: .0005/.004"
#4; .0013/.0043"

Main bearing thickness (front-to-rear measurement):

#1: 1.098"
#2: 0.942
#3: 1.244 (thrust bearing)
#4: 1.224

Note: If the thrust bearing is a .060" undersize, the thickness is different, 1.256". Unless the crank has been ground WAY undersize, all the thrust bearings are the same thickness.

I don't have an end-play specification handy at the moment, but your machine shop should be able to check on it for you.
Jerry

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