HMR 12mm Head stud kit for the 89-93 Dodge 5.9L 12 Valve Cummins Turbo Diesel
These studs are made from 4340 material and have a black oxide finish, 190 ksi min.
Same great Haisley Machine Design, now manufactured by ARP.
The head bolt holes in the Cummins blocks are not tapped to the bottom. Haisleys has designed these studs with more threads for less stress to the block as well as the stud.
You will need a 12mm x 1.75 bottoming tap. If you do not have one, select the option and we can include one with your stud kit for a fee.
Studs hold up to 80PSI of boost!
STUD SETS INCLUDE:
* 26 STUDS, NUTS & WASHERS
* ARP MOLY LUBE
All kits include 26 studs, nuts, 12pt nuts, assembly lube and instructions.
These studs DO NOT require machining the rockers for proper clearance. They are full length and only some grinding on the valve cover is needed.