I'm not sure how many cylinders it is.. I thought it was 4.
The guy said he took it out of a tractor trailer rig, rebuilt it, then stuffed it in that GMC on a bet.
He's got a Chevy Astro van with a balls out corvette engine in it with a 5 speed behind it.. another one of those deals where somebody said, "I bet you cant..."
Not sure what sort of stock rear end that GMC would have had, but if it's anything like they put in the '50 Chevy 1/2 ton I had, it wouldn't be much good for speed, but you'd have enough torque to pull a house off the foundation, i'd bet!
