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Old 11-28-2012, 03:24 PM
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main bearing questions

What are undersize and oversize bearings.my crank was turned. 010 so i would need oversize right since there should be .010 more bearing metereal

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Old 11-28-2012, 03:27 PM
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.010 under for describing bearings.

.010 over for describing pistons.. (.010 .020 .030 etc)
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Old 11-28-2012, 03:32 PM
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Quote:
Originally Posted by C-10 View Post
.010 under for describing bearings.

.010 over for describing pistons.. (.010 .020 .030 etc)
Well my local parts store has them for over and undersize main bearings
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Old 11-28-2012, 03:49 PM
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Mic the crank. Use the numbers/size to buy bearings.
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Old 11-28-2012, 05:32 PM
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If you tell the parts store your crank was turned .010" under and they don't know what bearings to sell you, then I'd either get another salesman, or another parts store.
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Old 11-28-2012, 07:06 PM
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Quote:
Originally Posted by 95chevy406 View Post
Well my local parts store has them for over and undersize main bearings
As said earlier you want 0.010" undersize bearings. The package will often have -10 as a suffix, or just 10.



The individual bearing shells are also marked for size. The King bearing below is a 0.010" undersize bearing:



There are 0.001" and 0.002" oversized bearings, sometimes used to selective fit bearings to journals for a closer tolerance. These are called X and XX bearings, respectively. I'm not aware of over the counter oversized bearings for a SBC that would be 0.010".
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Old 11-28-2012, 08:22 PM
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While we are on the topic of bearings,here is a link on the difference kinds of bearings to choose from:

Getting Your Bearings: Engine Builder
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