I have a 1992 S10 Blazer with 312,000 miles on it. The body is still pretty
good. Excellent paint, just some rust starting to appear finally.
Entire suspension is new, interior is almost perfect. I want to keep
driving it since it's paid for.
I've always considered putting in a V8, but after seeing all the work and
weird sh&* that needs done, I think I will stick with a 4.3. I have a
coworker who's dad's truck has a 4.3 with over 300K. He hit someone with it
and it's now parked, but still runs. I can have it for next to nothing.
This will allow me to slowly build a new motor for mine.
What can I do to the 4.3 to give it more power? I can get most of the
machine work done for free. (well, lots of beer anyway) New cam, port the
heads? Bore it out? I want fairly good mileage but would like to have some
more punch. Can someone list all the things I can do as it's being built to
add more power or torque? I drive a LOT on the interstate, and pull a
Should I put a shift kit in the tranny? What things can be done there? Would
I need a customchip programmed for the mods I do?
Almost every part for a 350 will work in your 4.3. There are some obvious
exceptions. There are rebuild kits for the 4.3 I know Northern Auto Parts
carries them - http://www.naparts.com /
You can go as exotic as you are willing to pay. Getting 225 HP isn't all
that much work.
Your best bet is to buy a book (or your local library) on engine building.
Depending on your level of knowledge, you might want to start more basic or
more advanced, but there are a lot of books out there with the info you
need. Much of that info can be found on the net as well.
You need to establish the condition of your motor(s). Depending on how much
time you have and such you can learn a lot by tearing a motor down, but do
your homework first. You should do this in a clean environment (or as clean
The 4.3 out of your donor truck should work even though it is a 2 wheel
drive model. This is not my area of expertise though. If you do go the
route of the 350 swap, www.jagsthatrun.com sells the manual for how to do it
and what you'll need.
You can do a lot of things, I still reccommend a motor build-up book. You
can also get a speed parts catalog from various shop that list a lot of the
This is by no means an exhaustive list, but a few off the top of my head.
Google for a few minutes and you'll find tons of info.
Port and polish heads
SLIGHTLY hotter cam, getting too radical makes the engine not as nice on the
better flowing exhaust from headers to the end of the tail pipe
You can do various things to modify cylinder diameter as well as compression
chamber size (you can bore out the cylinder, use various thickness in
gaskets, dome topped pistons etc.)
Improve fuel delivery system
Improve air delivery system
Improve ignition system
Adjustable computer chip system
Reduce friction whenever possible, reduce rotational weight whenever
Remember, as you increase power, you also increase heat. Reducing friction
whenever possible helps, but you also need to make sure your cooling system
is up to the task, as well as your oiling system. I personally would have
the block boiled to make sure it's passage ways are clean. I would also do
a full cooling systems clean and flush.
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