Yes V6. On a local automotive forum, someone has a V6 big block out of a 1971 GMC 5500 truck for sale. Wants $1500 for it. Think of the potential to run something different.

V6, 478 CID
5.125" bore, 3.86" stroke. My 540 only has 4.500" bore! Can you say pistons the size of a coffee can?
Factory rated at around 230HP at 3700 rpm and 440 pounds of torque at only 1400 rpm.

Just think what a custom valve grind, sheet metal intake, bigger valves and some port work to the heads could produce.

Drop the engine into a third gen or some other small car and go enter into the V8less races.

 

Have you seen the size of it? I saw pics, and a BBC V8 appears to be smaller. There was interest a while back with someone putting one in a f-body.

Didn't they come in tractors?

 

yeah, i guess you could make "big" power, but i think they weigh more than an iron headed bbc and they make less power/ci comparatively...

 

With 5-1/8" bores of course it would be huge. It would be for someone who really wants to do something different. There's zero aftermarket performance parts. It doesn't share any parts with the BBC.

The GMC 5500 would be a 5 ton truck. It was never put into something like a pickup truck. Maximum rated rpm is only 3500

http://en.wikipedia.org/wiki/GMC_V6_engine
http://www.6066gmcguy.org/305V6.htm

Dry weight is 925 pounds. It may be a little tall to put into a third gen.

 

Yup, pretty much a tractor motor.

Note that the spark plugs are on the INTAKE side of the head. That should give you a little clue about the head design. :barf:

As many of those as there were all through the 60s in pickups and delivery trucks and dump trucks and school buses and such, you'd THINK, if it would make a good racing motor, there might have been one or 2. But I can't say that I've EVER heard of one used that way. I'm thinking .... maybe there's a reason?

But yeah, GMC made those things in displacements from 305 (the most common, BY FAR, found in pickups) up to 500-something. The 305, 350-some-odd, and 427 are the ones I've come across the most.

 

I swear one day i will get one and use it for somthing. Ive always been interested in these motors

http://www.6066gmcguy.org/305V6.htm
http://www.6066gmcguy.org/351V6.htm
http://www.6066gmcguy.org/EngineData.htm

They even combined 2 6's to make a V12 model!!
http://www.6066gmcguy.org/TwinSix.htm

The v6's sound pretty awsome stock too. http://www.6066gmcguy.org/engines/v6sound-1.wav


the biggest one they made was this puppy. 440 ft. lbs. of torque @ 1400 rpms....are you kidding me??? Put some modern performance parts in that thing, omg. That would be too cool.
http://www.6066gmcguy.org/Jolly-478v6.htm
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Here is a vid of a v12 somone fired up

http://www.youtube.com/watch?v=pha8W_AcDaA

 

They have that one running on propane. Looks like a good engine to drop into a truck for a pulling contest. Lots of stump pulling low rpm torque. Sure sounds cool for a 12 cylinder. Really reminds me of the 12V92 Detroit diesels. Two 6V92's mated together. The old Silver 92's.

 

When I was a kid, we had a '65 3/4 ton GMC pickup and '64 2-1/2-ton farm truck with the 305 version. The school had a bus with one as well. The Co-op had a spray rig with the 401.

I drove that pickup a lot. I thought they were the cat's meow.

Until the school bus driver told me the bus sucked gas like crazy and didn't have any more power than the V8's. I thought he was blowing smoke.

Until I drove a '68 Chevy farm truck with a 327.

The glamor faded pretty hard after that.

 

Cough... ratrod ... cough.

 

my friends dad has a gmc plow truck with a 351 v6, dump body. its pretty beastly. everything around there has rotted out exhaust including this so it sounds pretty weird. Not fast or anything...it plows snow ok but thats about all its good for. If you can put that in anything other than a truck youd be my hero

 

I drove one in a 68 GMC 1/2 ton with a 3 speed stick on the column. It was the 305 and it whipped my 67 Chevy with the 307 like I was running on 7 cylinders...

I really liked it but it is SUPER heavy.