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Oversize cam bearings
https://www.slantsix.org/forum/viewtopic.php?t=29827		 Page 1 of 1
Author:  6shotvanner [ Tue Jul 01, 2008 3:50 pm ]
Post subject:  Oversize cam bearings
Anybody know anything about them? Been backyard wrenching for 40+ years and I've never heard of them :oops: Went to order up a set of bearings today and the parts guy asks me "standard,010,or 020?"Now I already know that I don't know eveything but I swear I've never seen,heard of,discussed or been asked that question ever :? The mech thats putting mine in is gone for a few days so I cann't quiz him about this.So I put the question out on this forum,is this a common rebuild item on the slant?line boring the cam journals for oversize bearings?It's looking like my book learnin didn't go far enuf :o
Author:  volaredon [ Tue Jul 01, 2008 8:34 pm ]
Post subject: 
Sure he heard you say CAM bearings? I don't know about O/S ones available for the slant (Doc/Dart 270/Charrlie S would be your best bet) but I recently saw an episode of one of the car resto shows (might have been Hot rod TV it was one of that type of show) where they did a similar thing on a furd motor; one of theirs has all 5 cam bearings the same size thru the block and another has one bearing that is the same ID but larger OD and they showed line boring the block for these other bearings; I believe it was the 390 that had a spun bearing and something like the 2nd from back bearing on a 460 that was the same ID as all 5, 390 bearings with a slightly bigger OD; If they came up with such a solution on this particular engine, I'm sure that's not the only such case. If your engine has a problem here, get ahold of a bearing CATALOG (yes paper not on a computer screen) and go to the back buyers guide section; often you find technical specs of all the given parts the company makes and can find a workable solution, to salvage an otherwise scrap block. It may be cheaper for you to find a non damaged block to start with.
Author:  6shotvanner [ Wed Jul 02, 2008 9:29 am ]
Post subject: 
Yup,repeated 3 times,"we're talkin cam bearings?",answer"yes,standard size in stock,oversize is special order".My block should be ok,just dealing with a spun cam bearing and now confusion on this oversize thing :? Maybe Doc will chime in sooner or later,I know this is a new one on me.It's a "real"parts store so maybe they'll let me take a peek in the old paper catalog.
Author:  Doc [ Wed Jul 02, 2008 9:36 am ]
Post subject: 
I have seen the listings also but never had to use any.
I am unsure if the oversize is the outer bearing shell or the inner babbit surface. :?

Personally, I would not go through the expense to jig-bore a cam line so it would except o/s bearing shells... I would find another block or a think of a different way to deal with the problem. (epoxy)
DD
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