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Old 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

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Old 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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Old 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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Old 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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Old 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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