GMC V12 powered car

[playingwithfirehurts]

he should do uphill mud trials like in england

[blmyachtsales]

What did you use for a transmission?

[OsakaBancho]

I think, and this is just my opinion, I would make a custom valve cover so it would look a bit more like a V12.

[TestECull]

I would totally be powersliding that thing around the field until I either ran it out of gas for the third time or killed mahself in a barrel roll

[stinson48]

Too freaking man!

[mrspivvy]

I'm confused- at first I thought this was a detroit 12v-71 or something but evidently not- what did this motor come from originally?

[philyt]

@mrspivvy GMC "Twin-Six" V12. Used in heavy duty trucks in the 60s before diesels were widely used, as well as generators and irrigation pumps. It's basically a pair of GMC V6s. One block, one crank, one cam, 4 cylinder heads, two intakes, and two carbs. 700 ft lb of torque at around 800 rpm

[mrspivvy]

@philyt ah gotcha, thanks for that, I'd never even heard of these before. seems like an impresive bit of kit- 700 ft lb at 800 rpm!!! dread to think of the MPG tho, a V12 gas engine in a truck

[yamahonkawazuki]

@mrspivvy would be LOL/city and WTF/hwy. but stilol if one built one of these/restored it, fuel mileage wont be concern 1. these engines, i want. BTW werethey known as a balaur?( have seen them referred to as such)

[ryansiki]

You could pull a fully loaded big rig trailer. Nice to see a Twin Sixer. They just keep on going....

[flyingscrapyard]

After seeing this engine in pieces and hearing what work it had been doing, they certainly are a durable piece. They definitely are made to Boss Kettering's moto "Parts left out cost nothing and cause few service problems". They are a tough old ox.

[jviturbo]

very nice!!! what was the engine out of originally? it looks very much based on the 409.... please post some specs on the engine and maybe some more build pics/video. GAS IS FOR BURNING!!! LONG LIVE BIG CUBES!!!

[IcyTexx]

Cool!

[flyingscrapyard]

The project started as an interest in an engine that he had seen a reference to and wondered are there any still around. Not many people in Australia had any idea about them. He then got a friend to look for one on his visit to the States. His friend brought one back with him so it was pulled down, examined, & repaired then put on a stand to admire. It seemed a shame not to then power something with it so he built a car to put it in based on the early racers with big torque engines.

[D375]

Well ... yess ... but ... that bloke has put a vast amount of skill and effort into the car ... so, I thought, if you were doing that, it would be good to have a car that you could wind out, to say racing speeds. After all, it's modelled on the old racers, isn't it? ....

Slit pipe spokes belted into place with a hammer, seems to be out of kilter with the terrific workmanship in the rest of the car. If I built it, I'd love to be able to tool around town in it .... [:-)

[flyingscrapyard]

Don't worry about the workmanship on the wheels. They are every bit a well crafted as the rest of the car. They aren't exactly blacksmith made, not that blacksmith made would be a bad thing if done by a skilled man. Considering the gent who built this is self taught and spent his earlier years farming for a crust, you would be amazed at the craftsmanship of the things he has made. Yes, it probably could have been made road registrable but he felt it wasn't worth the hassle for a plaything.

[D375]

Awesome piece of work - but why?? The car can't be wound out, by the look of it? Slit pipe for wheel spokes?? Man, he would have been better off - and safer - using wooden spokes!!

[flyingscrapyard]

Well yes, you make wooden artillery wheels for it. As for being safer, when the wheels were being trued up after fabricating, the builder bolted the wheels down and belted the rims with a sledge hammer to true the wobble. The sledge hammer didn't make much of a difference and as they didn't wobble any worse than some truck rims, he decided that they didn't run too badly after all. As for why, does everything have to have a rational reason for its existence? Haven't you ever tried things for fun?

[MusikLP]

Crash that inviremental idiotik thing! It is just a piece of shit!

[aroncbds]

Nice construction!!! What MPG would you get with that?

[papabugs71]

I thought the twin 6's were (2) GM 305 V6's??

[Alisterwolf66]

Essentially, the 702 "Twin Six" was a pair of 351 V6s sharing a common block, crank, and camshaft, not a bolted-together setup, as is the common misconception. The distributor was unique to the Twin Six, as well.

Except for those components, every other part was interchangeable with the six-cylinder engine it was based upon.

[2boredfortv]

err, can you say torque?

[biggdaddy2001]

sonds like a dam v6 still

[kukidude70]

passes everything but a gas station.haha.

[matts6887]

U probably aint kidding about that one!!! Im sure it probably if ur lucky only gets 5-10mpg, MAYBE 15 on a good day but probably not any more than 15....

[Alisterwolf66]

*laughs* And even that's optimistic! These engines in truck applications seldom saw anything above 6mpg. Average was 3-4mpg in an 8000-series truck or tractor. Ah, the cost of diesel-killing power...

15mpg? Maybe going down an 8% grade in neutral, with the engine idling at 200rpm. And a tailwind.

[joejoe133]

why would you get more mpg moving in neutral than not moving you mean 5th gear?

[akumabito2008]

is it yours?? If it is; congrats! You're my hero of the day! How 'bout the car itself? What transmission was used? Rear axle? is the car completely scratch-built? Amazing project, truly!

[flyingscrapyard]

No. It is a friend's car. It is built using a Toyota Dyna light truck chassis with the steering suitably modified. Gearbox is a five speed crash box from a Perkins powered Commer truck. The rear end is the Dyna's diff housing with an Albion 1.98 to 1 centre. The wheels are home made centres into truck rims. The spokes are pipe cut lengthwise and curved before welding to the rims. Body is all home made. Fuel tank came from a Massey harvester. It is quite something to drive!

[vanwahlgren]

Looks like 2 V6's welded together.. pretty cool..

[80K25]

Thats a 702 GMC V12, single piece block, 4 seperate V6 style heads. Actually blows a stock 350 out of the water for power all around. Badly.

[bulletman100]

Well, I do admit I had it wrong, but actually I had suggested connecting 2 350 engines together, which would make a difference. Thanks and sorry about my mistake on what it was.

[flyingscrapyard]

Like a lot of GM products of that era. Rugged, easy to work on, nothing there unless it needed to be there. When this engine got pulled down, it was a simple as a 350. It had been running but the valves were almost burnt square. The top edge around the pistons had been burnt away. Incredibly durable. I believe these engines were retired to run pumps 24/7 and were only stopped to change the oil. This car is very tall geared but you can still feel the massive torque waiting to get out.

[bulletman100]

two 4.3 V-6 engines hooked together. thats all. why double GM's worst? put two olds 455s together and get some power. this thing is less power than a stock 350 V8.

[va4cqd]

it pre-dates the 4.3L by 20 years. built in the 60s for big trucks. 630 ft lb torque made to run on low grade gas.

an industrial engine

[bulletman100]

My mistake. I can see it now. I did some research on it after the post and I agree it is an impressive engine.  Thanks for the info!

[tinycat06]

Those are not 4.3L those are two GMC 351CI V6s out of 1965 trucks and a stock 1986 Buick Grand National

V-6 turbo would tear that up...I had an OLDS 455 it lives on today

[maplelaffs]

thats what it is

[rednecksinspace]

That looks a lot like 2 V6's mated at the crankshaft...

[WARD5KUSTOMZ]

dude!!

[rpeek]

That's completely awesome..