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- 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
- Fits:
- EL 1936-1940
- FL 1941-1947
- Replaces OEM: 17435-39, 17438-39, 17441-39