New Member Here. I have a quick question.

Is there a certain year 4.0 head that I need to get if I was planning to put a 4.0 head on my 258 for increased power? Also have any of you guys upgraded cams in your 258? (maybe a comp 4x4 extreme cam?) If so how did it run? Soory about all of the questions. I'm trying to get the most out of my 258 in my 73 cj5.

 

really hard to answer those questions without pictures............

p.s. welcome from atlanta.......I'm sure some feedback will follow.........

 

The 4.0L HO head is the one that you want. This was used from '91 on. Earlier heads aren't much better than the 258 heads.

Lots of info on the net about this if you search.

No cam yet, maybe someday. How it runs will depend on which cam you pick.

Welcome from Boston!

 

look for a 91 to 99 4.0 head with the casting numbers:
91-95: #7120
96-99: #0630

Avoid the pre 91 and the post 99
post 99 #: 0331

4wheeler magazin ran a stroker motor buildup guide for their November 2007 issue. It goes over all that stuff. Those 2 heads were their reccomendations for best performance and compatability.


Welcome from jersey!

 

Thanks for the help guys. I will look and see if I can get a 91 to 99 4.0 head. Also I'm not sure if my 73 cj5 already has a small lift on it or not but I wanted to maybe raise it 2" from where it stands with some greasable shackles. Would this be too much lift for a shackle lift? And Would I need to buy new shocks for the extra height?

Thanks

 

Yes, and it depends. A shackle lift more than 1" is excessive IMO. Realize that you get half the lift that you extend the shackle - 4" longer is way too long. JMO - no offense to anyone - shackle lifts are a hillbilly mod (for lack of a better term). They both change the suspension geometry and loosen up the coupling of the axle to the frame. Avoid.

If you want longer travel, the stock upper shock mount may not allow it. The compressed length has to more than half of the extended length. Measure at full extension and at full compression.

Why greaseable shackles? I'd think a 2" lift with poly bushings would be a much better choice. You get a little more flex than with bronze bushings, and poly is more durable than the original silent blocks.

 

Thanks for the help. I'm kind of new to jeeps so I don't know too much about greasable shackles and stuff. I'm looking for the cheapest way to lift my jeep a little bit. I may lift it more later and stuff some 33s under it when ny wallet will allow it. But for now I want it to look better have maybe a little better articulation (if I can afford what needs to be done) with the 31x10.50 Bfg MTs (They are like brand new). What would be the best way to go to do this to my cj5?

 

:iagree:

 

Maybe I should just wait until I can afford to do the bigger lift and 33's after these tires wear out. It seems to perform well the way it is.

Thanks for the help guys,
Let me know what you thin

 

Drive it! Wheel it! Even the most stripped-down, factory-equipped, no-option CJ-5 will do amazing things and go wonderful places.

 

Thanks for the help

Thanks for all of the help guys. I'm going to keep the 31's and run it. Maybe even buy lockers soon. I've searched around for any nice bumpers with a grille protector bar for a 73 and I can't seem to find any. Does anyone make these for a 73? Will a 76 bumper work?

Thanks for all of the help again.

 

Can't answer your question specifically, but almost everything on a '76 and later CJ is different from a '75 and earlier. The intermediates ('72-75) are mostly the original CJ-5 chassis, suspension and body with upgraded drivetrain components. This includes AMC's engines, and a longer front clip to accommodate the inline 6s. The intermediates are an interim design, prior to AMC's complete rework of the CJ in 1976. The intermediates seem to have the worst parts and accessories support of all three eras.

Both the '71 and earlier and '76 and later frames are different from the intermediate frames, so I expect bumpers/grille guards for either won't fit without some cutting and welding.

<edit> on second thought, I recall the stock bumper (the piece of black steel channel) is the same Jeep PN 535 5342 through 1986. So if the bumper uses the stock mounts, a custom bumper/grill guard for any CJ should fit. Note that the frame horns are different though, as is the front crossmember, so if those are involved in the fit...

 

Got any welding skills? Or a buddy that does?
If you check the fabricators forum and some of the other threads here, you can get some ideas for really cool front bumpers, and you can design exactly what you want.

 

One of the new rags that just came out, I think Fourwheeler, has a great article on building a 4.6 stroker and talk about the head issue and which parts to use. Nickmil