4.2 to 4.0 swap?
seanmnew
Jeeper


What would it intail to swap the AMC 258 i6 / 4.2l for the 4.0? I have done swaps before, but not this one... would the tranny bolt up? or would i have to use the 4.0 tranny? if i used that could i use my Dana 300 ? or would it be better and easier to do the 4.0 head swap? I am just trying to get rid of my carbureted
stuff
What problems are you having with your carb?
I currently live in Colorado Springs, which sits about 6300 or so feet, and i do most of my wheeling at 8000 to 14000 feet! The carb is just not reliable enough for me, i have stalled out on steep hills when it floods out, and im just tired of going down hills backwards! To me a throttle body or fuel injection is priceless!
Oh it'a also 105 octane so you can mill your head to increase compression. & it's cheaper than gas to boot.It's cheaper to convert to propane. All you need is a mixer & a tank, I have some buddies that use fork lift tanks. Tuneups last longer, it runs cleaner & it'll run upside down.Better have dry sump with a big oil tank for that though.
I'm running a "Holley Off Road Avenger". It's far & away the most reliable & trouble free carb I've ever run. I've run a lot of carbs, this is the best.
I understand the changing altitude issue though.
I dont believe i feel like going propane lol, it took me long enough to get to learn all the workings of a gas engine, dont feel like dealing with more!
one thing i have not noticed is it saying anything about the ability to run as a daily driver, could i set this up to run gas normally and propane when i go wheeling? or would it be cost effective enough and not too much on the engine to run propane for daily driving?
$300 bucks and put together a throttle body setup.
You can take a throttle body off a 4.3L chevy and with an adapter plate, computer and misc sensors can make your AMC 258 i6 / 4.2l throttle body injected. It's simple easy to work on and it's pretty cheap.
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