One of the main
problems with putting a chevy engine in a
jeep is trying to cool the 255 HP that come
along with it. The old AMC 304 was 125 HP,
which is about half the chevy. The rule of
thumb is that you have to cool 1/3 of the
engine's power, so roughly...twice as much
as before. I examined all the available
options, including high performance thick
core aluminum radiators. They can get pretty
pricey, and I figured I would just destroy
it on the first trip out. Also, the fan on
the 350 stuck out a little further than the
AMC, and was going to make installation of
the radiator difficult.
The choice I made
was using the stock radiator with a monster
4000 CFM electric fan from derale.
I also bought a
Derale thermostat to turn the fans on
and off automatically. I couldn't get it to work,
though, and had to send it back for a replacement.
Summit Racing is pretty good with returns, and even pays
for return shipping.
I rebuilt the radiator mount so that it
could be taken off as a complete unit, as the
radiator to fan connection is made with one-use
straps. Also, you can see the extravagant hose I had
to put together to reach the water pump. The jeep
radiator's inlets are on the opposite side compared
to a chevy.
After running the engine up to
temperature, I was disapointed to see it creep over
up to 220. It didnt get any hotter than this, but
would not stay at 190. I again looked into better
radiator, but chose to buy an oil cooler. It has its
own mini radiator, which straps to the front of the
existing radiator. It seems to have added the extra
cooling that was needed.