Originally Posted by DanS HJ-45
Slow, but reliable, and torquey. The later models of Power Wagons got a 251 cubic inch flathead six (same engine basically, but produced in Canada). They are the "hot rods" of the bunch. You can tell them because the grill isn't flush with the rest of the sheet metal, it sticks out about 1/2" on the later models with the big motors. They are still underpowered.
But power is overrated.
Easy upgrade for the later model trucks is to a flathead 265 ci. Same engine as the 251 just stroked (I think.). Lots of vintage speed equipment for that one including dual carb intake and dual exaust. They still suck on power though. I think with all that your still only talking 125 HP max, and about 10 MPG. Top speed 42 miles per hour. The 251 and 265 engines can be put in the earlier trucks, but it takes about $500 of radiator work to make it fit.
There are kits available to drop in a 318 or 360 without any chopping of the frame. You can put the original motor back in, in a weekend. I have never ever heard of anyone swapping back to a flathead who installed a v8 though.
I'm building my own custom '51 Power Wagon with Polysphere 318, Dana 70 axles front and back, NP205 transfer case with PTO, and 10K Braden PTO winch with Capstan.
This is one of my other Power Wagons... a '53 Swivel Frame. One of maby 40 or so ever built. This is what they did for traction before the advent of lockers.
The frame swivel in the middle so you keep all the tires on the ground, and no body flex. Fairly caveman, but it works. I've installed a set of lockers, and it's unstopable. The limiting factor was my courage. At extreme angles the carb will flood or starve out of fuel. I've stalled it once in a place where stalling was a very bad thing and I thought I was going to meet Jesus.
The Carryalls are very cool, and pretty rare. I have only seen a few. I think only about 8000 were built. I had one once, but it was a complete rust bucket, only good for parts. And that is typical for the majority that are left today
The one being sold above looks like a good one from the picture and description.
I am on the hunt for a nice clean FJ60 if anyone has one to sell in Washington State.