Carb/Manifold/Header Setup 258

[74G8R2]

Restoring my 1980 CJ7 and want to upgrade the left side of the engine a bit. Original AMC 258 i6 / 4.2l overhauled by a professional shop and cam upgraded to a Comp Cam X4250H. After surveying as many threads as I think I can absorb, here's the setup I'm considering and would appreciate constructive feedback on the combination including pros, cons, better solutions. Don't want to use original iron manifolds and curb appeal also plays into the performance goal.

CJ will be a football tailgate toy to pass on to kids/grandkids and be driven mostly on the street. Thanks in advance for the help, and here's a picture of current condition just to whet your appetite. See my signature for the rebuild thread. Be safe out there and thanks again.

Holley 4160, 390 CFM, 4bbl, electric choke, vacuum secondary (Summit Racing)
Offenhauser 5999DP, dual plane, 4bbl (Summit Racing)
Hedman Headers 99606, High Temp Coating, dual outlets

 

[Marsh Dweller]

Great looking build you have going on there. Next for me is the OME lift so Ill have to ask you about that when the time gets closer. I have the setup I think you are considering minus the cam. I bought mine in Dec and it came with the Offy 6257DP, Holley 8007 390 CFM, and full Borla exhaust. I think the 4160 number is in reference to something else (maybe the secondaries?) The number 4160 is ALL OVER their webstite on almost on every model. I went by the video on their website on where to find my part number. Also I looked at the manifold you mentioned and it doesn't look like it has a place to mount power steering but the 6257 does. Mine runs well and I'm happy with it but I think it might run better after I sort things out. Seems the PO has the vac advance hose and the full vac manifold hose reversed and when I switch them it runs terribly. Got a timing light coming tomorrow so maybe I can get it running better.

 

[74G8R2]

Thanks for the reply Marsh Dweller, I was beginning to wonder if my recent posts have been working. I double checked and the Offy 5999DP does have attach points for the PS pump bracket. Good luck with your new CJ.

 

[Peanut Butter]

Came across this yesterday and thought you might like it:

Big Power Jeep Straight Six Stroker Build on a Budget:

https://www.youtube.com/watch?v=WlHrqhwojf0&list=FLwrPirPoR0pSDkZ0QIvogNA&index=4&t=0s

 

[74G8R2]

Came across this yesterday and thought you might like it:

Big Power Jeep Straight Six Stroker Build on a Budget:

https://www.youtube.com/watch?v=WlHrqhwojf0&list=FLwrPirPoR0pSDkZ0QIvogNA&index=4&t=0s

Wow! That's cool ... thanks PB