"Roller" Rocker Arms

"Roller" Rocker Arms:

The M73 uses Roller Rocker Arms to actuate the valves. Use of roller rockers in place of solid rocker arms allows for a more aggressive camshaft profile and reduces the overall rotating friction in the valve train.

The reduction of friction:
- improves fuel efficiency
- reduces heat
- increases camshaft life

The roller rocker is constructed of a cast metal arm. The roller is attached to the metal arm by a centering pin. The roller incorporates a needle bearing that rotates on the centering pin.