have a 64 cj5 f head with all stock and original parts which also utilizes the pto in the transfer case for a front bumper winch. want to upgrade my engine because 45mph won't cut it. what is the most reasonable and prudent engine in which i can use and not burn up my stock/original transmission and such? thanks for your response
you could try to find a dauntless 225 v6 as it was an option back then or put an OD in like I have and i can reach 70 with ease. You could also try an iron duke 4cyl as they are more easy to find. It may take a while but I can. I like the f134 personally cause of the gasmiliage. Oh and i can hit 75 with the wind shield down too with the warn od, which makes it scary too.
Any modern 4 or V6 would fit. Many opt for the Buick 225/231/3.8 or Chevy vortec V6. Take a look at Advanced Adapters, and Novak for adapter availability and cost. Might spend some time on the Novak knowledge center as well.
Either way, you will be spending some coin to do the swap. You will also be looking at either a gear swap or an OD to get the engine revs down to an acceptable level.
Best case scenario is to find an old rot out donor and swap in the drivetrain (and axles).
the gm 4.3 carb'd version would be the easiest, imho. your drivetrain should be fine with it if you don't get crazy off roading it. i found a 4 cyl out of a 1981 cj5 that is going into my '66 cj5 right now. i'm wanting to keep my column shift tranny linkage so the 'iron duke' will clear everything easily for me. these guys will make any swap work for you:
The Chevy 4.3l is a great motor. Swapping out a motor is not easy, but this one is as easy as it gets. You add power to 6 or 7 pink wires and it will run (for the fuel injected version). Just like the other guys mentioned, novak is a great site for the adapters. For the wiring I got a subscription to alldata for the donor vehicle and the vehicle you're putting it in. I did this swap last year in my CJ7 and I love it.
i'm guessing your axle ratios are either 5.38 or 4.27. either one will be fine for tires up to about 32" depending on tire type. 235/85x16 are 32" but a skinny tire that you could run. 32/11x15 would be harder because of their width added rolling resistance. your current tires are somewhere between 28 and 29", again depending ont type and manufacturer. with anything newer than your current engine, you should be able to handle it. imho.
1966 CJ5A, mods are coming
1966 Wagoneer, bone stock