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95chevy406 11-28-2012 02:24 PM

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

C-10 11-28-2012 02:27 PM

.010 under for describing bearings.

.010 over for describing pistons.. (.010 .020 .030 etc)

95chevy406 11-28-2012 02:32 PM

Quote:

Originally Posted by C-10 (Post 1616751)
.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

C-10 11-28-2012 02:49 PM

Mic the crank. Use the numbers/size to buy bearings.

1971BB427 11-28-2012 04:32 PM

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.

cobalt327 11-28-2012 06:06 PM

Quote:

Originally Posted by 95chevy406 (Post 1616754)
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.

http://i.ebayimg.com/t/193-176-CONTI...!!oQ~~60_1.JPG

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

http://www.ffcars.com/photopost/data...00903_0001.JPG

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".

1Gary 11-28-2012 07:22 PM

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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