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02-24-2007, 07:51 PM
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crank journal wear specs on SBC engines
i need to know what the smallest main and rod journal diameter would be ok with stock bearings
2.45 and 2.10 are stock diameters how do shops check these? just with a pair of basic calipers ? or ? thanks Last edited by fast68; 02-24-2007 at 08:01 PM. 
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02-25-2007, 02:52 AM
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they are checked for size with micrometers. The finish is also checked mostly by feel. The machinist then will either polish the journals, or turn them undersized to either .010 .020 and .030 being the max.
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02-25-2007, 09:56 AM
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ok so if i take the crank to the shop real quick to have him check all the journals -what would be the smallest diameters i would want to see and still be ok to use std. replacement bearings ?
thanks 
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02-25-2007, 10:58 AM
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mains 1 2.4484-2.4493
2-3-4 2.4481-2.4490 5 2.4479-2.4488 rods 2.0988-2.0998
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02-25-2007, 07:34 PM
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A Strip of Plastigage,+ alittle Test Fitting on your engine stand will tell you whether you need Slightly Undersized Bearings......
If the journals are still mirror smooth,+ Round,..... you can get bearings at .001/u, I believe.......
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