Hi Frank, I could well be mixing up my wides and narrows on the block. Should wait till after coffee till I write and was in to big a hurry to get out the door to a paddling expo.
The DOHC swap uses a different belt tensioner than a SOHC. So the parts on the engine needed are head, oil pump assy oil pickup. All tensioner and rollers. Covers obviously. And of course the pistons are different for valve clearance.
The truck waterpump will need some machine work for clearance to the tensioner and belt path as well as changing the flange for the pulley for the accessory belts.
Some custom work also needs to be done with the water outlet. If there is room behind the engine you can use the existing thermo housing. There rarely is room back there.
Since the truck could well be a narrow block, I would just swap a turbo motor in. But then the stock transmission will be the limiting factor.
As far as the existing engine in the truck. The rings will have a bit of wear to them but the bores should be fine as long as the were not run long with a leak. When the engines are around 200K you can get by with a quick freshen. Consider a set of rings and rod bearings. If the truck sat the rings could well be stuck in a couple of cylinders. The DOHC heads do not warp and I would expect the head on that truck should be fine. I would just block sand the face of it since surfacing it leaves the cam bores out of alignment. At minimum swap in a factory head gasket and drive it for a year or two.
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