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Thread: Bearing Clearance

  1. #1

    Bearing Clearance

    When i check the oil clearance on the rod bearings with a telescoping gauge and micrometer i come up with .003 clearance.When i use plastigage i come up with .002.I think .002 is too tight but which method is right.The engine is a 620 big block chevy with steel rods.Thanks

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    Assuming that you are torqueing the caps on to proper torque specs i would trust the telescope gage more than the plasti-gage, although i don't use either method, i use a dial bore gage which is more accurate, but i also have gage blocks for setting the dial bore gage.
    I agree that .002 is too tight for any racing motor and i usually buy .001 over bearing or polish the crank .001 under.


    JMO

    Zip.


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