william50

What is the size/threads of the intake/exhaust manifold stud on a 90xj 4.0?

Number 10 in the attached diagram.

CCKen

The 1990 Stud part number is J4007462.


This number has been superseded by 53010165, which is a later model stud. The dimension on the 53010165 stud is .375-16/.375-24 x 1.75".


The dealer should have them. I bought a set about two years ago and Mopar America still lists them.


http://www.moparamerica.com/oe-mopar/53010165

william50

Thank you for the info.

Is there a reason why the threaded part that goes into the head is so short?

Any idea on how deep the threads go into the head?

CCKen

.

Jeep Driver

I used 3/8 bolts all around.

Studs be damned.

OverlandZJ

The ends are locating studs that stay in the block.. helps with exhaust/intake manifold installation.

Jeep Driver

Cut the heads off two 2" bolts, use as setting dowels. Snug all the other bolts, replace dowels with bolts.

Just as you do installing the head.

cruiser54

Coarse short threads to go into the head. Long fine threads to go through manifolds and have nuts/fat washers on them.