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GMC V6 and V12 Engines Engine repair and rebuilding

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  #21  
Old September 1st, 2018, 06:15 AM
LEWISMATKIN's Avatar
LEWISMATKIN LEWISMATKIN is offline
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Default Re: 637 V8 gas engine

and while dad's shop was open and in it's original location, I ran across a guy who had a 637 overhauled. He took his shaft to Graves Plating in Florence, Ala., and had it chrome plated. It was running fine at the time, but that was about '80-'81.
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  #22  
Old September 1st, 2018, 06:16 AM
bigblockv6 bigblockv6 is offline
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Default Re: 637 V8 gas engine

Louis, a few months back I bought a set of those valves, though the seats are the same diameter the stems are shorter than the GMC valves. Evidently it would require the valve springs. This won't work with my setup since I'm running a custom ground high list cam with longer Ford 390 valve springs. The correct way for me to go is with some custom Manley stainless steel exhaust valves
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  #23  
Old September 1st, 2018, 06:19 AM
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Default Re: 637 V8 gas engine

how much shorter, Pete??
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  #24  
Old September 1st, 2018, 06:19 AM
2-Ton 2-Ton is offline
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Default Re: 637 V8 gas engine

Yep that the engine, But the picture does not show how really big it is.
The emblem is the same as Mine has on both sides of the cab.
No pictures of the engine, but once you get past the pirate ship and skin you will see a few other GMC's that could be for sale.
https://www.flickr.com/photos/149052261@N05/

Don
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  #25  
Old September 1st, 2018, 06:20 AM
bigblockv6 bigblockv6 is offline
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Default Re: 637 V8 gas engine

Most likely the original exhaust manifolds cracked and replacements were impossible to find so someone fabricated their own.
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  #26  
Old September 1st, 2018, 06:28 AM
bigblockv6 bigblockv6 is offline
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Default Re: 637 V8 gas engine

Quote:
Originally Posted by LEWISMATKIN View Post
how much shorter, Pete??
I'll get the measurements out tomorrow when I get back home and I'll post some picks of both the Cat and GMC valves for comparison.
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  #27  
Old September 1st, 2018, 06:35 AM
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Default Re: 637 V8 gas engine

thanks, Pete!:biggring mc:
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  #28  
Old September 1st, 2018, 07:45 AM
BobBray BobBray is offline
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Default Re: 637 V8 gas engine

Neat and very rare truck! The only gasoline powered 'Crackerboxes' were the '66-'68 FE/DE versions with the 637. To my knowledge the 702 V-12 was never a regular option in the 'Crackerbox', though it was in the L series 'Steel Tilt'. There were Toro-Flow 637 powered 'Crackerboxes' as well, I would imagine those are just as rare.
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  #29  
Old September 2nd, 2018, 05:05 AM
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Default Re: 637 V8 gas engine

bob, some of the DW & DL did have the 702 in them. At least that is what my parts books from that era state. It was also in some of the DB cabs.

Last edited by LEWISMATKIN; September 2nd, 2018 at 05:07 AM. Reason: additional info
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  #30  
Old September 2nd, 2018, 06:40 PM
bigblockv6 bigblockv6 is offline
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Default Re: 637 V8 gas engine

Quote:
Originally Posted by bigblockv6 View Post
I'll get the measurements out tomorrow when I get back home and I'll post some picks of both the Cat and GMC valves for comparison.
The valves are 1/2 inch shorter over the stock GMC valves as you can see in the pics. It's possible there may be longer versions, if not I'll just go with some Custom Manley stainless steel valves
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