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09-05-2020, 09:46 AM | #1 |
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Oversize OD main bearings for 37 21 stud block
The very last check I made before taking my oh so carefully cleaned tested and prepared 37 block to be bored was to bore gage the mains to be sure I had the correct main caps installed. In the process with the aid of searches here on the Barn I discovered that the main bores are .015" oversize. I understand why, but now I need bearings, or else I have to start the process over with yet another block, this is the 5th block I've cleaned and magnafluxed to get one useable block.
Does anyone here have those bearings for the .015 oversize bores? Or can you direct me to someone who might? My crank is .020 under, but I'd consider any undersize, doing another crank would be faster than finding another block. I had one knowledgeable Barner tell me that Ford never made a rear main bearing for oversize blocks, is that true? My block has all 3 bores oversize. I've been pondering how to sleeve the bores to make them work with standard bearings. We have ways, but it seems to be impractical. Anyone ever try it? Last edited by Yoyodyne; 09-05-2020 at 10:05 AM. |
09-05-2020, 10:51 AM | #2 |
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Re: Oversize OD main bearings for 37 21 stud block
I have some oversize in the block rear mains inserts --don't know exact sizes though, can look later today
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09-05-2020, 11:39 AM | #3 |
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Re: Oversize OD main bearings for 37 21 stud block
Try Fred at Southside Obsolete. http://www.southsideobsolete.com/Sou...e/Welcome.html
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09-05-2020, 11:49 AM | #4 |
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Re: Oversize OD main bearings for 37 21 stud block
Be sure to get the block pressure tested, mag doesn't find all of the possible cracks on a flathead block. Better to find a problem before you sink a lot of money into it.
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09-05-2020, 11:59 AM | #5 | |
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Re: Oversize OD main bearings for 37 21 stud block
Quote:
Where are those new blocks Tod? |
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09-05-2020, 12:36 PM | #6 |
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Re: Oversize OD main bearings for 37 21 stud block
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Terry
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09-05-2020, 12:59 PM | #7 | |
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Re: Oversize OD main bearings for 37 21 stud block
Quote:
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09-05-2020, 02:11 PM | #8 |
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Re: Oversize OD main bearings for 37 21 stud block
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09-05-2020, 02:15 PM | #9 |
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Re: Oversize OD main bearings for 37 21 stud block
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09-05-2020, 02:20 PM | #10 |
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Re: Oversize OD main bearings for 37 21 stud block
I have some of those bearings. Need to check for .020
Chuck |
09-05-2020, 02:20 PM | #11 |
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Re: Oversize OD main bearings for 37 21 stud block
I have some of those bearings. Need to check for .020
Chuck |
09-05-2020, 02:27 PM | #12 |
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Re: Oversize OD main bearings for 37 21 stud block
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09-05-2020, 02:27 PM | #13 |
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Re: Oversize OD main bearings for 37 21 stud block
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09-05-2020, 03:48 PM | #14 |
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Re: Oversize OD main bearings for 37 21 stud block
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09-05-2020, 04:47 PM | #15 | |
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Re: Oversize OD main bearings for 37 21 stud block
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I see. He wasn't specific, just said Ford didn't make them. I asked for other sizes, got no answer so I took that as no rear bearings of any size made. |
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09-05-2020, 06:09 PM | #16 |
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Re: Oversize OD main bearings for 37 21 stud block
The rear main .015" os in block, .020 on journal is #68-6331 Z However, the length between flanges in block is .010 us. total length thrust to thrust is std. Check the width of your blocks flanges.
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09-05-2020, 07:18 PM | #17 |
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Re: Oversize OD main bearings for 37 21 stud block
The block is 2.083" I have a rear cap from a junk block that measures 2.090" Is the 2.090 standard?
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09-05-2020, 07:56 PM | #18 |
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Re: Oversize OD main bearings for 37 21 stud block
Standard length is 2.095-2.097
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09-05-2020, 07:59 PM | #19 |
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Re: Oversize OD main bearings for 37 21 stud block
if you can't find .020 bearings, 68 6331 AA is .030 on crankshaft, .015 os and again .010 shorter @ flange
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09-05-2020, 08:18 PM | #20 |
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Re: Oversize OD main bearings for 37 21 stud block
Thanks very much for that Brian. Looks like neither length is correct here. The length issues I can deal with, we have ways to machine it and I can even handscrape if necessary. Putting material on is tougher, but a spacer or shim on the length would not be fatal.
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