Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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!
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| | | | Joined: Aug 2013 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2013 Posts: 59 | I have a 1965 V6 GMC long bed step side 8 bolt wheel how can I tell what size this motor is
Thanks bob
Bob May
| | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Not sure where the engine number is on your GMC but if you can find it I know some guys here can decode it. There is also a vin buster here on the bolt so check out your vin number and see what it says to. | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Welcome to Stovebolt. You'll find info on the V6 and lots more here. That is not meant to say you aren't welcome on this site. I'm not aware of any 'VIN buster' for GMCs but there is serial number info on the 60-66 site also. | | | | | Joined: Apr 2010 Posts: 436 'Bolter | | 'Bolter Joined: Apr 2010 Posts: 436 | I'm not absolutely positive, but I thought all the 60-66 GMC V6's were 305cid, at least in the 1/2T - 3/4T trucks. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | I think he asked how to tell what size his engine is, not what size engine it came from the factory with. They may or may not be the same. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | This appears to what will decode the engine and where to find the numbers. Looks like GMC continued with putting the engine displacement at the start of the serial number, like the earlier GMC engines.
Bill Burmeister
| | | | | Joined: Aug 2012 Posts: 402 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 402 | I think they used to just stamp the size of the engine on the top manifold pad....like 305 or ?
http://s1055.photobucket.com/user/baldybenny/library/ 1936 1.5 wrecker,1937 gmc coe,1939 Chevrolet coe,1942 4x4 coe, 1942 coe,1946 dump,1947 2 ton dump,another 1947 2 ton dump,1950 coe,1967 c30,1937 cat 22,1936 Chevrolet 5 window foremans coupe, 1914 ford speedster.
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