Sifton Knucklehead rocker arm shaft set. Front intake measures 4-1/8 and has an actual ground surface of 4.115. Rear intake measures 3-5/8 and has an actual ground surface of 3.6. Rear exhaust measures 4-5/8 and has an actual ground surface of 4.6345. Front exhaust measures 5-1/4 and has an actual ground surface of 5.119.
FITMENT
TECH NOTES
ACCESSORY ITEMS
Tech Notes
Shovelhead rocker arm shims may be used on the left side of