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#51689 - Sun Oct 30 2005 11:11 AM 302 GMC six
ttodd Offline
Shop Shark
Registered: Sun Feb 13 2005 12:00 PM
Posts: 561
Loc: Mo. Ozarks
I have found some 302 gmc motor out of some WW ll duck type trucks. there are several of these. Will the military motors work with regular chevy an gmc parts. Most of these motors run good what would they be worth.

Thanks Tony
ttodd's toys
#51690 - Sun Oct 30 2005 12:19 PM Re: 302 GMC six
tclederman Offline
Registered: Tue Sep 18 2001 12:00 PM
Posts: 24615
Loc: Jarvisburg, NC

In general, most of the parts are different. GMC parts seem to be a little higher-priced and a little harder to find than the same parts for a Chevy truck engine.

The GMC 302 is an excellent engine that is more easily adapted into GMC trucks than into Chevrolet trucks (the GMC engines are a little longer than 216/235/261 Chevrolet engines.

Maybe others will state an opinion on the value of an unknown-condition 302 (or, any used 40-50 year old engine). Shipping cost is also a consideration when setting a value of an engine (from a buyer's perspective).

Here is a Convert to a 302 Tech Tip found elsewhere in this forum.

#51691 - Sun Oct 30 2005 04:13 PM Re: 302 GMC six
OldSub Offline
Cruising in the Passing Lane
Registered: Sun Oct 05 2003 12:00 PM
Posts: 6663
Loc: Seattle, Washington
GMC motors are similar to the Chevy motors, but very few parts interchange. The distributor is an example of what will swap. Intake and exhaust manifolds do not swap.

As Tim says hop up parts for GMC motors are not as common and generally cost more.

I have a GMC 270, which is externally the same as a civilian 302 and like the power the motor makes. I'd love to replace it with a 302.
Its true, I really don't do anything but browse the Internet looking for trouble... . . .
'55 1st GMC Suburban . '54 GMC 250 trailer puller project. '54 GMC 250 Hydra-Matic . '54 Chevy 3100 . '47 Chevy COE . and more...
#51692 - Sun Oct 30 2005 08:24 PM Re: 302 GMC six
ttodd Offline
Shop Shark
Registered: Sun Feb 13 2005 12:00 PM
Posts: 561
Loc: Mo. Ozarks
I should have a reply for the amount of engines .
There should be around fifteen or twenty of them.
ttodd's toys
#51693 - Sun Oct 30 2005 09:21 PM Re: 302 GMC six
oldchevy46 Offline
Shop Shark
Registered: Thu Dec 27 2001 12:00 PM
Posts: 839
Loc: Moscow, ID. USA
I would not give more than $200 for a unknown engine unless I knew for shure there was no cracked head or block,
But if there was any info about past history of moter I would be pretty intresed
keep us updated on what you find out
I could take 2 at least:-)
Luke Dahlin

1946 Chevy 2 ton
1966 Chevy 2 ton
1969 Chevy 3/4 ton 4wd]1969 Chevy 3/4 ton 4x4
#51694 - Mon Oct 31 2005 07:10 AM Re: 302 GMC six
Tony Offline
Extreme Gabster
Registered: Fri Jan 28 2000 12:00 PM
Posts: 6258
Loc: Where men are men and trucks a...
Military 302's have no provision for a mechanical fuel pump,use an electric pump instead.That,a few un needed lumps on the engine casting,a different front pulley is the primary differences.
A stock 302 rebuild costs about same for a Chevy 261 for example,it all depends on how much work you do yourself and if you're lucky at scrounging parts.
#51695 - Mon Oct 31 2005 03:44 PM Re: 302 GMC six
GMCpanel Offline
Shop Shark
Registered: Mon Apr 29 2002 12:00 PM
Posts: 2664
Loc: Springfield, MO
15-20 302s??? Are these in Missouri?
Get a REAL truck, get a GMC!
1954 GMC De Luxe COE
#51696 - Mon Oct 31 2005 08:27 PM Re: 302 GMC six
Fred T Offline
Master Gabster
Registered: Tue Jun 27 2000 12:00 PM
Posts: 5174
Loc: Wichita, KS
They're worthless. I'll come get them if you'll buy my gas so you can get rid of them. wink Sounds like enough that I will have to make two trips. grin

Let us know when you get them. Some of us would give our first born for one.
52 3600
69 C-10
#51697 - Tue Nov 01 2005 06:13 PM Re: 302 GMC six
bobadame Offline
Junior Member
Registered: Fri Oct 21 2005 12:00 PM
Posts: 8
Loc: Fort Collins Co.
I'd give $500 each for two good engines.
x x
#51698 - Tue Nov 01 2005 07:36 PM Re: 302 GMC six
reo_guy Offline
Registered: Thu Aug 17 2000 12:00 PM
Posts: 416
Loc: southeast SD
Stock, the DUKW would have had a 270. The DUKW is worth a lot of money, please don't part it out if it is salvageable.
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