Anyone know the difference between 80 and 81, 258 motor around the intake manifold / head area? I have seen a few parts like valve covers and Offenhouser intakes that list 81-86 year models. The 76-80 years must have a different head?
Somewhere in there they changed the head bolt size and I 'think' the 81 to 86 has the valve cover that bolts down to the head. The older heads like I in now have no bolt holes for the valve cover, it is only held on with two center bolts to the rocker bridges. They also went from a 1 bbl carb and intake to a 2 bbl one somewhere right around that time.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT'sJimG wrote:
IIRC, there were quite a few changes between 82 and 83. Two that I know about are the change to a plastic valve cover and removal of the belt driven air pump. 83's came with a 2 bbl Carter carb (don't know about other years).
I have an '81. If you want to talk about what you have, I'll either confirm or deny that mine is the same.
I did have a belt driven smog pump and a 2bbl carburator. (These were replaced in favor of the Mopar MPFI Kit.) I have a steel valve cover with screws around the edge to hold it on. The intake manifold had a heater in it that didn't work. What else?
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.