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carburetor/motor help! #962648 09/10/09 05:56 AM
Joined: Jul 2007
Posts: 81
Y
yotaman1224 Offline OP
Getting the Wheeling Fever
so i got this here 1976 jeep cj5 with the 4.2 258 motor and i bought a carburetor cleanin kit and it had a bunch of wrong stuff and i just ran the number on the carb and come to find out its off a older ford 300 straight six motor so now the question is could i have a 300 six ford motor bolted to my jeep 3speed and tcase or is it more likely that the threw a ford carb on my jeep motor????????

From the Off-Road World
Re: carburetor/motor help! [Re: yotaman1224] #962649 09/10/09 07:00 AM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
Quote
so i got this here 1976 jeep cj5 with the 4.2 258 motor and i bought a carburetor cleanin kit and it had a bunch of wrong stuff and i just ran the number on the carb and come to find out its off a older ford 300 straight six motor so now the question is could i have a 300 six ford motor bolted to my jeep 3speed and tcase or is it more likely that the threw a ford carb on my jeep motor????????


It is a common swap to change out the Jeep carb for the Ford six cylinder one. It is uncommon to actually install a complete Ford engine. In fact I've not heard of the ford six cylinder in a CJ.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: carburetor/motor help! [Re: yotaman1224] #962650 09/10/09 08:16 AM
Joined: Sep 2005
Posts: 1,087
BobRowe Offline
Body Damage is Cool
It's not likely that you have a Ford 300 I6 in your Jeep, because that motor is longer than the AMC 258 I6. Plus, the tranny fitment would be a problem. Anyone wanting more cubes than the 258 typically installs a small block AMC or Chevy V8, which are actually shorter.

It's much more likely that a PO swapped out the 258 carb for one from a Ford 300. that's relatiely easy to do.


1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
Re: carburetor/motor help! [Re: BobRowe] #962651 09/10/09 03:46 PM
Joined: Jul 2007
Posts: 81
Y
yotaman1224 Offline OP
Getting the Wheeling Fever
would this result in increased performance? should i stick with this carb or get the right one?

Re: carburetor/motor help! [Re: yotaman1224] #962652 09/10/09 05:17 PM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
That particular motorcraft carb works pretty good on the jeep engine. It seems to give a bit less economy. But it is the easiest of all carbs to work on. It is simple compared to the stock carb.
If you observe closely there should be a home made adapter piece between the carb and the jeep rod that opens the carb. As there is a difference in how the two carbs have their opening pins. If this adapter isn't made well the carb won't open all the way.
Many guys have installed the wrong carb on their Jeeps and they run way too rich. YOUR carb should have a --108-- stamped on it somewhere. (I think that is the correct number, I havn't done one in several years) If the number is other than that the carb is too large for the Jeep engine.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: carburetor/motor help! [Re: BigJim] #962653 09/10/09 05:37 PM
Joined: Jul 2007
Posts: 81
Y
yotaman1224 Offline OP
Getting the Wheeling Fever
i ran the number on the carb and its off of a 1981 ford f150 with the inline 300 six the number was 7394 ill look for the 108 but i just went and got the right rebuild kit and some new spark plugs ill let you know what happens

Re: carburetor/motor help! [Re: yotaman1224] #962654 09/10/09 07:42 PM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
Quote
i ran the number on the carb and its off of a 1981 ford f150 with the inline 300 six the number was 7394 ill look for the 108 but i just went and got the right rebuild kit and some new spark plugs ill let you know what happens


That sounds like the correct carb.. The 108 will be CAST into the carb.. I'm remembering it is on the bowl on the side near the choke stuff.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: carburetor/motor help! [Re: BigJim] #962655 09/11/09 05:19 AM
Joined: Jul 2007
Posts: 81
Y
yotaman1224 Offline OP
Getting the Wheeling Fever
got the carb kit for that model truck and now its runnin like a bat outta hell no hesitation lots of power, and i found a 107 cast ont the butterfly valve???? but yeah after takin it for a ride now the new fuel pump that is on it is crappin out im gonna go for a electic unit

Re: carburetor/motor help! [Re: yotaman1224] #962656 09/11/09 06:00 AM
Joined: Feb 2000
Posts: 6,247
4x4Wire Offline
Trail Leader
***
My memory is fuzzy on those year engines and fuel pumps....

But, is that one that has the level actuated by the revolution of the cam?

If so, due to age, you could experience wear on the cam lobe which will impact fuel delivery.

BTDT with an AMC 304. I want to say the 258 has a similar setup.

Remember:
Jeep = Just Empty Every Pocket and you will have Just Enough Extra Parts.

and, you can say - Fix It Again Tony


John Stewart
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Re: carburetor/motor help! [Re: 4x4Wire] #962657 09/11/09 06:08 AM
Joined: Jul 2007
Posts: 81
Y
yotaman1224 Offline OP
Getting the Wheeling Fever
lol yeah thats what i hear (just empty every pocket) it does have the lever action pump with the revolution cam and since the fuel pump is brand new i was figuring that cam is the problem im thinkin about just orderin a couple cheapo inline fuel pumps of ebay (so i have a spare) and makin some cheazy block off plate

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