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Old 09-14-2010, 02:12 PM
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283 Main bearings

I took the crank out of my 283 and noticed that the bearings on the block side are grey except the first bearing which is slightly worn and shows some silver. On the bottom side the rear and front bearings are grey. Two other have grey with skips of silver and the second bearing from the back is almost all silver. I would have expected more wear for a 65. There was a lot of oil in the bearings. Were these incorrectly gapped with too much clearance or is that how they are supposed to look?

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Old 09-14-2010, 03:45 PM
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If those are the original GM bearings I`m not sure what they were made of then but I took apart a 65 327 years ago that was original and looked the same. Later on the material in bearings were changed and gave a different appearance.
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Old 09-14-2010, 03:51 PM
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Don't worry about it until you see copper.
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Old 09-14-2010, 06:37 PM
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Quote:
Originally Posted by Mertz
I took the crank out of my 283 and noticed that the bearings on the block side are grey except the first bearing which is slightly worn and shows some silver. On the bottom side the rear and front bearings are grey. Two other have grey with skips of silver and the second bearing from the back is almost all silver. I would have expected more wear for a 65. There was a lot of oil in the bearings. Were these incorrectly gapped with too much clearance or is that how they are supposed to look?
Sounds close to perfect. Blocks aren't perfectly straight, nor are cranks. Cranks aren't perfectly balanced one crank pin to the next and operation causes all sorts of twisting and unwinding. The wear sounds like it's in millionths of an inch which is mighty, mighty good. I surely wouldn't do anything like align boring or honing to the block, it's unlikely the situation you see can be improved upon. Same goes for the crank.

Bogie
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Old 09-15-2010, 09:21 AM
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Thanks guys that should save me some money. It looked pretty even to me except for that one cap. I think I will leave the crank and caps alone. BTW the rod bearings were also pretty good but did show more wear.
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