- Speed And Science ® designed Billet Aluminum (6061-T6) Rocker Box system for the Harley-Davidson™ Shovelhead models.
- Bolt-on installation for all ’66-’84 models equipped with either billet Speed And Science heads (recommended) or cast OEM heads with OEM oil supply system.
- This system provides superior fit and function vs. castings.
- EVO style shafts (included) provide perfect, oil leak free seal.
- Extra clearances provided for hi-lift applications.
- The Speed And Science Rocker Boxes are designed for OEM shape rockers (standard or roller type, not included in the kit).
- Two-piece construction allows for easy clearance check between moving elements.
- The design is sealed with replaceable orings for easy maintenance and longevity.
- Warranty details and conditions are listed in the Installation Manuals ( Manuals download page )