Shaft Mounted Roller Rocker Arms for 420 Hemi Predator
- Super strong, high-ratio rocker arms (1.3 ratio)
- Fits 420 Hemi Predators. Will not fit old style 420s or Hondas.
- Must shave pin hole width - .010/.012" to fit 301 Hemi Predators.
require shorter pushrods (typically 5.160 or 5.110, depending on camshaft and head milling).