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Old 01-13-2009, 06:11 PM
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Main bearing clearance on a small journal 327?

What is the proper bearing clearance on a small journal 327? I've heard and read a few different measurements.

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Old 01-13-2009, 06:49 PM
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The rule of thumb is, anything under .001 is not enough, and anything over .003 is too much. I`ve seen both sides of the scale. Under .001 will result in a spun bearing. And anything over .003 results in a loss of oil pressure. So if you can, shoot for .0015
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Old 01-13-2009, 10:48 PM
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.0018 - .002 (street motor)
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Old 01-14-2009, 11:01 AM
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mains

What is the application for this engine??

cast or steel crank???

Keith
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Old 01-21-2009, 07:01 PM
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Not trying to hijack but why does main bearing clearance depend on application?

Last edited by enduro54; 01-21-2009 at 07:11 PM.
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Old 01-21-2009, 07:12 PM
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Forged crank, going in a dirt track car
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Old 01-21-2009, 07:49 PM
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.0025-.003 would be great for a race engine. Forged metal expands more than cast when it heats up, plus since it is a race engine a little looser on the main and rods will be fine since it will be spun up 90% of it's life.
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