These Adjustable Rocker arms are a reproduction of the original Early Chrysler 331, 354, and 392 rocker arms.
These are refered to by the factory, as 300 B, C, and D adjustable rockers.
They are made from an Investment Cast Chromoly 4340 Steel. They are CNC machined to exacting tolerances,
and then Heat Treated to a tensile strength in the range of 200,000 psi.
These adjustable rocker arms come with the same size adjuster as the original Chrysler rocker arms.
Customers can disassemble their original hydraulic rocker arm assemblies,
clean and install these rocker arms in place of the non-adjustable hydraulic rocker arms,
thus eliminating the need for adjustable pushrods and the special tools needed to adjust them.
The adjusters are made from 86L20 steel which is case hardened by nitriding process for wear resistance.