my86mj Posted September 22, 2012 Posted September 22, 2012 to keep it short i want a carbed inline six but in my area a 258 it a pain to find but parts are everywhere so how can i get a 4.0 to run off a carb for cheap. sarge needs a new heart and my 2.8 gave up the ghost before i could do anything worthwhile to the rest of the rig. I want a carb. i know all the advantages to FI but its my preference.
87Warrior Posted September 22, 2012 Posted September 22, 2012 You will need an electric fuel pump with a regulator to drop the pressure down for a carb. A 4.2 intake will bolt to a 4.0 head with very minor grinding and a 4.0 header. Ignition will be the tricky part, but I believe the HEI setup for a 4.2 will work in a 4.0.
Zenobian_84 Posted September 22, 2012 Posted September 22, 2012 Right on man. Those 4.2s are awesome!
cruiser54 Posted September 22, 2012 Posted September 22, 2012 You will need an electric fuel pump with a regulator to drop the pressure down for a carb. A 4.2 intake will bolt to a 4.0 head with very minor grinding and a 4.0 header. Ignition will be the tricky part, but I believe the HEI setup for a 4.2 will work in a 4.0. HEI will drop right in. 4.2 intake with a Weber. Woohoo.
Eagle Posted September 22, 2012 Posted September 22, 2012 I'm sure some of the aftermarket companies still make electric fuel pumps that produce 7 psi for use with carburetors. It would have to be mounted externally but no regulator will be needed. Check Summit racing.
my86mj Posted September 22, 2012 Author Posted September 22, 2012 my biggest thing is i want no electronics i like having an old fashioned setup electric fuel pump is okay but i essentially want a 4.0 with a carb on it so sweet
Comanche County Posted September 23, 2012 Posted September 23, 2012 I see 258s on on CL all the time from CJ and YJ guys swapping in v8s.
my86mj Posted September 23, 2012 Author Posted September 23, 2012 i heard there was a problem with spacing on the intake ports on the 4.0 head where theres bumps for the injectors and the 258 intake doesnt cover that any thoughts on how to overcome that?
87Warrior Posted September 23, 2012 Posted September 23, 2012 i heard there was a problem with spacing on the intake ports on the 4.0 head where theres bumps for the injectors and the 258 intake doesnt cover that any thoughts on how to overcome that? When I was swapping a 4.0 head on my 4.2 I did not notice any intake manifold mating issues. I did have to grind some down on the bottom of the intake manifold due to some alignment pins stuck in the 4.0 head. Real easy fix to see and understand when trying to test fit. This was on a 90YJ with the Carter carb that had stepper needles. Does Offenhauser still offer a 4.2 intake manifold? If so, that coupled with a Weber carb would be slick on a 4.0.
mnkyboy Posted September 24, 2012 Posted September 24, 2012 A guy at work had a 258 with a 4.0l head and a carb in an eagle. He said it was fairly simple to put together. Its too bad he just sold the engine to swap in a v8,it was pretty heavily modded and had almost no miles.
my86mj Posted September 24, 2012 Author Posted September 24, 2012 i am planning on an offy intake and a edlebrock carb
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