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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,006 Posts1,055,268 Members48,418 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#73813 02/23/2007 9:01 PM | Joined: Jul 2006 Posts: 187 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 187 | I've been on Big Bolts and now I'll ask you guys, engine has 8 bolts on valve covers, forward distributer,wide across intake manifold, front runners on intake start at second set of cylinders  water pump is big unit looks like turbo casting, big engine in a 1951 GMC 640. I know it's not original engine, I just can't I.D. it. Thanks,.....Rick
'36 Tall cab Chevy 1.5 ton, '36 Low cab Chevy 1.5 ton, '53 GMC 2 ton, '51 GMC 640 5 ton, '47 Dodge 2 ton, '42 GMC CCKW 353 6X6.
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#73814 02/23/2007 9:11 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Clutchheadstew,
Interesting stuff. I don't know if GMC used many different vendors for motors, or just their own stuff. The vintage truck site shows a beautiful '51 640 and it notes it has a 503 engine in it. I used to drive a 10 wheel 'Cornbinder' with a huge gas V-8 in it, but my search didn't indicate IH made a 503 cubic inch motor....bigger, yes!
Someone with some knowledge will turn up I'm sure!
Stuart | | |
#73815 02/23/2007 11:56 PM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Any pix of it? And is it an inline or V engine? It kind of sounds like it may ba a big block GMC 6 that was used in the larger trucks.
Bill Burmeister
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#73816 02/24/2007 12:26 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | The 503 was a monster 6cylinder used in the 640 series. Rick, in another forum, mentions the engine he is trying to ID appears to be a V-8.
It sounds like it might be a conversion of sorts. Maybe the pictures are a click away.
My cousin lurks in that neck of the woods, especially in old abandoned shipyards...this truck sounds like it could be one of his treasures!
Stuart | | |
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