I have rebuilt my 258 and have been able to find little performance options. Does any one know a company that deals with Amc striaght six. Im planning one finding another block soon and build a high performance engine. :beer:

http://www.cliffordperformance.com/ they have some performance parts for the 258 inline six.

Hesco

put a 4.0l head on it, that is 40hp, MPI 35hp, header 10hp

'Pane! those engines run way better on it! :smokin:

NOS, get a summit fogger kit, power at the puch of a button :shaking:

Go with the Propane!!

MC 2100

About the cheapest 15-20 horses out there. I did mine for less then $40, Ill take a $2/ HP upgrade anytime.

MC 2100

About the cheapest 15-20 horses out there. I did mine for less then $40, Ill take a $2/ HP upgrade anytime.

I've got an '80, CJ-7, 258. But the MC 2100 only fits YJ's intakes. What are you doing to place a MC 2100 on the CJ intake?

Oh yeah, and I was told the Ford 300 distrubutor was an upgrade, 1) because of higher quality/available parts, and 2) because you can run High Energy ignition on them.

Any comments?

I've got an '80, CJ-7, 258. But the MC 2100 only fits YJ's intakes. What are you doing to place a MC 2100 on the CJ intake?

I don't know who told you that, but it's BS. The CJ and YJ intake are the same as long as the CJ is a two barrell intake. Both require an adapter for the MC2100. If your CJ has a one barrell carb swap to a two barrell intake manifold.

As far as the Ford 300 distributor, you've got some terminology wrong. It's a swap to the cap, rotor, coil, and wires that the 300 uses, not the entire distributor.

Why isn't this in newbie???

Oh yeah, and I was told the Ford 300 distrubutor was an upgrade, 1) because of higher quality/available parts, and 2) because you can run High Energy ignition on them.

Any comments?

http://worlds-yjs.jeepz.com/the_juice_box.htm
It's an excellent upgrade, I have it on my jeep... "the juice box" seems to be fairly cheap compared to spending the time to peice together.. Then put in a DUI or MSD ignition

An electric fan is also a good upgrade like blackmagic or a Ford Tarus fan from the junkyard.

aftermarket carburetor like 2100 or webber is deffinitly a worthwhile upgrade.

upgrade to headers like banks, borla or any other high quality headers as well as larger freeflow exhaust (I think stock is like 1.5, or 1.75? I upgraded mine to 2.25 or 2.5.... i dont remember, but it helped a bit)

As stated above the 4.0 head conversion is a good option.. with or without the MPI

Depending on your year/laws/location lack of smog equiptment will make it run better.

There are lots of things you can do to make it run better...

The motor I just rebuilt is .030 over mild cam 4 barrel intake heddmen header and dual flows. I rebuilt it before I found out about this site and nobody around my town seems to know anything about performance upgrades on the 258. :beer: + :jeep: = :crybaby2:

A good option is to build s stroker motor. There are several websites out there dedicated to building one. Some list all the part numbers you need to perform the build, and others are dedicated to building one from junkyard parts.

Here's one:

http://www.bc4x4.com/tech/bryce/stroker/stroker.cfm

Does anyone know if the MC2100 swap will keep a 1980 258 smog legal?

I just saw and read about the stroker and gotta have one. That will be my next project thanks. If there is any other web sites anyone can think that I can use please post them. THanks agian :p

Does anyone know if the MC2100 swap will keep a 1980 258 smog legal?

Not in Kalifornia. :shaking:

Not in Kalifornia. :shaking:
everything causes cancer in Kalifornia

everything causes cancer in Kalifornia


Including scabby Floridians :flipoff2: