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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old February 22nd, 2020, 03:09 AM
1972RedNeck 1972RedNeck is offline
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Default Main Bearings

Are all main bearings the same from 305 to 478 and 1960 to 1974? Anyone still supply them new or is NOS the only option?
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  #2  
Old February 22nd, 2020, 03:35 AM
tbucketnut tbucketnut is offline
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Default Re: Main Bearings

When you find out, let me know, looks like the sources are dried up and I'm wondering if I will be able to rebuild this block.
Steve
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Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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  #3  
Old February 22nd, 2020, 04:01 AM
1972RedNeck 1972RedNeck is offline
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Default Re: Main Bearings

I'm starting on my 478 stroker build and am a little worried about it. Is there anyone that makes custom bearings that could crank out a set or two? I only need the mains as I will be using either Big Block Mopar or Chevy rod bearings...
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  #4  
Old February 22nd, 2020, 02:45 PM
bigblockv6 bigblockv6 is offline
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Default Re: Main Bearings

Quote:
Originally Posted by 1972RedNeck View Post
Are all main bearings the same from 305 to 478 and 1960 to 1974? Anyone still supply them new or is NOS the only option?
Main bearings are the same on all displacement V6 engines other than the 1973-74 478M engines, these engines had completely redesigned bottom ends with larger diameter mains.
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Old February 22nd, 2020, 03:09 PM
bigblockv6 bigblockv6 is offline
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Default Re: Main Bearings

Quote:
Originally Posted by 1972RedNeck View Post
I'm starting on my 478 stroker build and am a little worried about it. Is there anyone that makes custom bearings that could crank out a set or two? I only need the mains as I will be using either Big Block Mopar or Chevy rod bearings...
I've frequently have seen main bearings sets on ebay, possibly try Rock Auto as well.
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  #6  
Old February 23rd, 2020, 01:19 PM
tbucketnut tbucketnut is offline
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Default Re: Main Bearings

Rock Auto has been dried up on main bearings for some time. Any other leads?
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Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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  #7  
Old February 23rd, 2020, 09:28 PM
1972RedNeck 1972RedNeck is offline
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Default Re: Main Bearings

Sent an email to Thunder V12, I would think that they have a source.

Provided that 702 mains are the same as the rest...
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  #8  
Old February 24th, 2020, 03:41 AM
tbucketnut tbucketnut is offline
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Default Re: Main Bearings

If not keep an eye on ebay type in federal-Mogul 4067M
I hit pay dirt today and bought a .020 under set for $95

There is another set on there from the same vendor https://www.ebay.com/itm/Federal-Mog...AAAOSwupBcv4C7

Hope I did not break rules by posting this link.
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Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
Reply With Quote
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