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Old 03-20-2013, 06:33 PM
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Engine main bearing mistake?

Im just test fitting my main bearings to do clearance measurements on my chevy 350. When i noticed that my rear most bearing (the one with the end play built in) the oil hole does not line up with the hole in the bearing. It does have 85% of the hole showing but not 100% of it.. it is in correctly and i cant move it. Is this a problem?
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Old 03-20-2013, 07:07 PM
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Quite common, not a problem. If you are not comfortable with it. Take a larger drill bit or chamfer tool and chamfer the just top of the hole in the block.
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Old 03-21-2013, 09:53 AM
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Quote:
Originally Posted by JR Piston View Post
Im just test fitting my main bearings to do clearance measurements on my chevy 350. When i noticed that my rear most bearing (the one with the end play built in) the oil hole does not line up with the hole in the bearing. It does have 85% of the hole showing but not 100% of it.. it is in correctly and i cant move it. Is this a problem?
X2 with BOBCRMAN. I'll add that this is something I worry about and use a die grinder with a small Dremel size bit to adjust the hole in the bearing shell such that it is positioned to fully open with the drilling in the block. Carefully deburr the shell after doing this.

Bogie
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Old 03-21-2013, 12:15 PM
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If i leave it how it is and run a high volume oil pump would that be counter productive? Or make no difference? I also contacted clevite and they said its no problem run it how it is. However its there product and i dont think they will want to say its an issue with it.
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Old 03-21-2013, 12:32 PM
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The mismatch has been present for decades, it will make no difference unless you are building a race only engine that only operates at constant high rpm
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Old 03-21-2013, 12:45 PM
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"I also contacted clevite and they said its no problem run it how it is. However its there product and i dont think they will want to say its an issue with it."

Not Clevite problem. GM built the case and the drillings are not quite to spec. Common for production.
Don't use a HV pump. A whole nuther can of worms.
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