The 4.3 is basically a v-8 conversion minus a couple of cylinders. A direct
bolt in, it is not. You will need alot of extra brackets, mounts, ect. Not
to mention a tranny and transfer case swap ( if 4wd). A 2.8 s-10 is just
that, blown motor is most cost effective to put another 2.8 in it but, a 4.3
swap will give you a whole different truck done correctly. Good luck either
way you go.
Yes you can drop in a 4.3L V-6 into an '84 S-10. That body style later came
with the 4.3 as an option, and it's even possible to transplant a 350 small
block into it if you are willing to do the work and spend the money. The
4.3 is not a direct drop-in replacement, however, because the motor mounts
and about two dozen other things are different, including possibly even the
tranny bolt pattern and transfer case if it's a 4wd. I'd also recommend a
larger radiator because the 4.3 will produce more heat as well.
Frankly since the truck is an '84 then you won't get any money out of it if
you upgrade motors, which will cost you more in labor and time than the
truck may be worth. It will be cheaper - and easier - to transplant another
2.8 into it and save yourself the time and money. If you are dead set on
putting in the larger V-6, then find yourself a wrecked donor truck of the
same body style with the motor you want and just do a direct swap, then sell
the donor truck with your old 2.8 to recoup some of the costs. However,
like I said before your truck is an '84 so just be careful that any work you
do doesn't exceed the value of having this truck up and running again.
Cheers - Jonathan
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