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Old 04-30-2013, 12:28 PM
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Cam bearing issue

Went to install cam bearings in my gen 1 sbc 350 and when i got to the last bearing it was too small for the block. It slid right through the hole. So I took another bearing out of the block I just installed and it did the same thing. Just freely slid through the hole. All the other bearings went in snug and fine but just that one? Bad bearing? Any thoughts? They were new bearings from summit and I installed them as it showed.

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Old 04-30-2013, 02:11 PM
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My machinist said he had to use two sets of cam bearings to get my sbc done right. He said "they're like that sometimes" , sounded like BS to me, seemed weird - I still don't understand it, but it's seems to be fine. ???

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Old 04-30-2013, 02:41 PM
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Assuming you installed the correct bearing into the right location? They're different sizes front to rear. Just a thought.
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Old 04-30-2013, 03:04 PM
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I put them in right spot. Even took the other ones out to see if they fit and the all slid righ through. Did you buy the same set again or a different size?
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Old 04-30-2013, 06:19 PM
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Some blocks are "repaired" at the factory with oversized bearings. Or the number 1 bearing. Check at a real parts store or a real engine building shop and see if they will sell you oversized cam bearings. They are available in several different oversizes for cam/line bored blocks, King bearing is a good source. Not listed in retail catalogs, but in rebuilders stuff. NOT CHEAP and you must order a whole set..

I once had a 302 Chevy that had all no.1 cam bearings (largest OD) thru the block.
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Old 04-30-2013, 08:38 PM
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I was going to say sounds like this engine had a prier life using a gear drive,but Bob's post is more plausible.
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Old 04-30-2013, 09:20 PM
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Quote:
Originally Posted by ForrestC View Post
Went to install cam bearings in my gen 1 sbc 350 and when i got to the last bearing it was too small for the block. It slid right through the hole. So I took another bearing out of the block I just installed and it did the same thing. Just freely slid through the hole. All the other bearings went in snug and fine but just that one? Bad bearing? Any thoughts? They were new bearings from summit and I installed them as it showed.
Most likely the OD is 0.010" or 0.020" larger than position #1. Plus 0.010 would be about 2.030", plus 0.020 would be about 2.040". Measure the bearing journal to see what you have.

Cam bearings traditionally go in from rear to front, rearmost is #5, front is #1. Position #1 has 2 holes and is the largest OD, so all the other bearings will be loose if placed in #1.

Last edited by cobalt327; 04-30-2013 at 09:25 PM.
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