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| | | | Joined: Apr 2008 Posts: 136 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2008 Posts: 136 | Can the gmc 302 fit the chev 3 speed?
This is from a old army truck about 60s vintage.
is it worth the bother and are they worth much.
I also found a 261 that hasn't run in 20 years with about 20 thousand miles, might be seized from sitting.
| | | | | Joined: Sep 2006 Posts: 2,393 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 2,393 | A GMC 302 is a highly regarded engine by inline enthusiasts.Not sure about what Chevy parts match up easily,but there are performance parts for this motor available. A 261 is a good motor too,although it sounds like you would have some serious rebuilding to do.
Drew
| | | | | Joined: Apr 2004 Posts: 72 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2004 Posts: 72 | I would snag both of them as they are both becoming hard to locate. The 302 is a very good engine and I am sure you could shoe horn it into you Chevy! I think some of the guys over at Inliners International have already done this.
52 GMC Suburban...52 Chevy 3/4 ton...49 CHevy 1/2 ton Rod...49 GMC 1/2 ton retro rod project
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | A gmc is a few incheslonger than a chev but that can easily be over come and has been done many times. You will need a civilian oil pan, Carb, ignition and generator. The military ran 24 volt. Also most of them ran automatics and had a different bell housing. There is a boss on the block that has to be ground off to accept a civilian starter and the military blocks do not have a place for a fuel pump so you must use an electric fuel pump. The best is to have a donor engine for all the parts you need. I have leaned toward GMC for 50 years, but there is nothing wrong with a 261. It's a lot easier conversion. | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | ".....the military blocks do not have a place for a fuel pump so you must use an electric fuel pump." To clarify this, military blocks do have a "place" for a mechanical fuel pump. There are just no holes there. Using a fuel pump gasket for a template, many people have put the holes in their engines. For a very detailed list of what needs to be done to a military 302, see http://www.oldgmctrucks.comTo answer your original question, your bellhousing will fit the 302 block. You'll need a GMC flywheel. Yes it is worth the bother. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I've got a '55 302 I'm getting ready to put in my truck. You will also need a new front mount plate if it has the "u" mount. The one from a 216-235-261 will fit but you have to pull the cam to install it. Earlier blocks have the standard front mount.
The nice thing about the 302 swap is that its a torque monster, it weighs about the same as the 235, has a 2bbl manifold already, and has a high mounted, short water pump.
They can be pretty expensive to rebuild if you are going for performance, though.
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