Measuring main bearing clearances...


Crank in place...



1 strip of plastigage on each main bearing journal...



Torquing the main cap girdle down to spec will crush the plastigage...



Remove the girdle and measure the width the crushed plastigage to get the clearance...

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Clearances:
Journal #1: .0017" (crank pulley)
Journal #2: .0016"
Journal #3: .0019"
Journal #4: .0017"
Journal #5: .0015" (flywheel)


Factory Spec: .0009" to .0017"
Service Limit: .0020"

Original bearing codes stamped on block/crank:
Journal #1: C2 (Green)
Journal #2: C3 (Brown)
Journal #3: B2 (Yellow)
Journal #4: B3 (Green)
Journal #5: B2 (Yellow)


Main bearing chart from Helms manual:

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