Can i Use a Ford 3.8 Engine to replace an existing Ford 4.2 Engine in an 1997 F150?

I have a 1997 Ford F-150 with a 4.2 V6 Engine in it. The Bottom Part of the Engine has Failed. This is a Rare and Expensive Salvage Engine to buy ($850), I want to know if i can use a $400 3.8L V6 Engine, Bottom end Block Pistons ETC. And mount the existing 4.2 Heads to it.

You can, but you're going to down a good 40 lb/ft of torque. And you would have to use a 3.8L out of a 1999-2004 Mustang as the, other split port 3.8L's were used in front wheel drive applications. You won't want to use a single port 3.8L (these are by far the most common kind)

The 4.2L isn't rare though. They aren't as common as the 3.8L but you shouldn't have problems finding one.

" I want to know if i can use a $400 3.8L V6 Engine, Bottom end Block Pistons ETC. And mount the existing 4.2 Heads to it. "

You would have to use a block from a split port 3.8L. The 4.2L and split port 3.8L have the same heads. The single port 3.8L has some incompatibilities with the split port 3.8L and 4.2L

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