4.0L help....

[Mrburns]

So has anyone ever rebuilt the top end of their 4.0L motor with 4.0L HO parts? I wanted to change the head over the HO head for better performance and greater aftermarket support....Anybody do this? does anyone know any problems involved with it? wiring...cables? etc.... Thanks

[Eagle]

I assume you have a non-HO? If so, the ports are shaped differently and the intake ports on the HO head are higher. The non-HO manifolds can be adapted to work with the HO head, but it isn't a bolt-on. Unless you spend a lot of time at high RPM it probably isn't worth the effort involved.

[doc2ya@yahoo.com]

I have a 1990 jeep cherokee limited that will not start. Their is spark to and from the cap to the spark plugs and fuel to the injectors. Need help.

Thank you, Doc

[sheeks175]

I have a 1990 jeep cherokee limited that will not start. Their is spark to and from the cap to the spark plugs and fuel to the injectors. Need help.

Thank you, Doc

Give a little more info. Have you done a compresion test? Your rings might not be sealed etc.