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Old 05-17-2005, 02:21 PM   #1 (permalink)
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Saw an interesting truck last weekend - 1967 GMC

I was at the antique truck show and this guy had a 1967 GMC tractor. I actually heard it before I saw it. Had a "raspy" bark to it. It was a cabover design and had a "V6" emblem on the front.

On this model, the engine is half exposed and upon inspection, it looked like an inline 6, light blue with the words "general motors diesel" on the valve cover. It really didn't look like enough room for a V6. Was that the original engine? It had a pulley on the back running the alternator. Is this a Detroit?

Just curious...
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Old 05-17-2005, 03:42 PM   #2 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

Yes, that's a Detroit. The 6V-71 Detroit has a pulley at the rear of the engine to drive the generator.
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Old 05-17-2005, 06:17 PM   #3 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

Must have been the old "Cracker Box" Cab. They had multiple configurations. Inline and V engines. Normal and set back front axles. And the strangest of all I-Beam and independent front suspension. Not even going to mention "Aluminum" blocks. These vehicles were replaced in 1969 with the Astro 95 and 1970 Chevy Titan 90.EDWARD
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Old 05-17-2005, 09:08 PM   #4 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

If it was a straight 6 it would have been a Detroit 6-71 (the 6V-71 is a V6...)

Both detroits typically had the generator/alternator located at the upper right rear of the block, belt-driven by a pulley the back side of the engine.

I've seen crackerboxes with V6 gas, 6-71, 6V-71 and 8V-71 Detroits and even once with a 701 cubic inch V12 gas. (Wouldn't have wanted to pay for fuel for THAT!) ...FB
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Old 05-19-2005, 09:00 AM   #5 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

Thanks for the information! When I was a kid, this is what I remember semi's sounding and looking like! I should have taken a picture! [img]/ubbthreads/images/graemlins/tongue.gif[/img]
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Old 05-19-2005, 09:05 AM   #6 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

BOB - Gas was CHEAP back when those things were on the roads! Lot of livestock trucking companies kept using gasoline powered tractors well thru the 60's & early 70's. Supposedly diesel exhaust was bad for the hogs & cattle. I remember Dad rattling windows in downtown Peoria, IL one night about 2 AM with a little short nose V-6 GMC single axle tractor/trailer. Think it was about 478 cid V-6? and empty the old girl ran pretty well! The exhaust note echoing back off the store fronts made the hair stand up on the back of Your neck! from the "Abbreviated Exhaust", cast manifold on each bank, followed by 3-4 feet of 2-1/2" exh. tubing and a burned out straight thru muffler off a FARMALL tractor on each pipe. Trucking Company's yard was right next to the town's IH dealer! [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 05-19-2005, 12:05 PM   #7 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

Dr Evil - The 478 V-6 would be right!

We had a GMC farm dump with that motor back in the early 70’s. It had about the same home-made exhaust system as well - we called those straight thru tractor mufflers “poor man’s cherry bombs”.

Anyhow that old V6 had a very distinctive (and loud!) exhaust bark. Also it was thirsty – about 4 mpg was the best it could do. But back then gas was 35 cents…so who cared?! ...FB
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Old 05-20-2005, 01:13 PM   #8 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

i belong to an email group that is crazy about those old v6 gassers. the 702 V-12 was called the "twin six". there's a good reason for this. GMC took the 351 V6, and cast a 12 cyl block and crank off it. This engine used 4 cyl heads, identical to the 351 heads, 2 351 intake manifolds, and two distributors. they got 2 MPG at the best of times, less when loaded. very interesting engines. these guys swear by those old v-6's. I've had a few of them over the years, and found them to be gutless piles of crap. very heavy duty though, they last forever and pull pretty good. just don't plan on leaving a stop light with any amount of speed. although one guy did put a 478 v-6 in his 1967 GMC pick up, and supposedly, it's quite a hot rod. the engine referred to the initial post was a 6-71. it's likely it was a crackerbox, B model, or an L model. all were available with this engine. the B model is really the coolest. I had one of those. they have gull wing hoods, and conventional pick up truck cabs. This was the predecesor to the GMC topkick, as the body sat about 4 inches above the frame.
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Old 05-21-2005, 07:32 PM   #9 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

That 702 "twin six" had weird single/dual ignition system as I recall. Consisted of a regular distributor base containing the centrifugal advance, vacuum advance and two sets of breaker points. This base was topped with a plain, flat cover.

Hung off the side of this base and gear driven by the vertical distributor shaft were a pair of 6 cylinder distributors laying horizontal in sort of a "Y" configuration to each other.

A rats nest of high voltage wiring left the the two distributors and snaked thru the valley of the "V" to the plugs.

Gotta think that adjusting timing the various breaker points and distributors was not an easy task!

Another thing I distinctly recall: The engines had a very unique - and pleasing - exhaust note. Very smooth and mellow, quite similar to an Allison V12 aircraft engine. ...FB
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'99 F250 PSD - bone stock.

My other diesel ride: The "Collosus of Roads": '79 Kenworth K100, tandem axle, 27' dovetail flatbed, NTC290 Cummins, 15 speed Roadranger.

Old tractors: '53 Farmall Super M, '53 Farmall Super H, '47 Minneapolis-Moline UTU.


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Old 05-22-2005, 01:19 AM   #10 (permalink)
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Re: Saw an interesting truck last weekend - 1967 GMC

The Air Force had a bunch of cabover GMC's with the 702 V-12. They were 4 axle (twin screw plus a tag), and their job was to pull around Minute Man mobile ICBM launchers. They were in service a very long time (up into the 80's). I saw one someone had bought surplus. Very smooth, very powerful, and 3 or 4 miles per gallon. One very neat truck.
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