Copper or fiber gasket for the small inspection plugs AND the rocker arm shafts (Same P/Ns). The original gasket was made of copper. We're out of the copper gaskets and have replaced these with a fiber gasket.
 
For Rocker Arm Shafts, Two (2) req'd for 149s, Four (4) req'd for 249s and Warriors.
 
Fiber/Copper