VTG OEM Harley Davidson Flathead Steel Valve Intake NOS WL Servi-Car 18070-32
Part #: 18070-32
Harley-Davidson part number 18070-32 is a Steel Intake Valve.
- Head Diameter: 1.625" (41.28 mm)
- Stem Diameter: 0.3395" (8.6 mm)
- Overall Length: 5.585"
- Seat Angle: 45 degrees
- Plain Steel: Standard OEM-style finish
- Black Nitride: A modern upgrade often used to improve heat resistance and durability with unleaded fuels
Fitment: The exact fitment for Harley-Davidson part number 18070-32 covers almost all 45 cubic inch (750cc) Side-Valve "Flathead" engines manufactured between 1932 and 1973.
- Servi-Car (G series): All 45" three-wheeler models including G, GA, GD, GDT, and GE from 1932 to 1973.
- WL Series (Solo): Includes WL, WLD, and high-compression WLDR models from 1937 to 1952.
- Military Models: Specifically the WLA (U.S. Army) and WLC (Canadian Military) produced primarily between 1940 and 1945.
- Early R Series: Some catalogs indicate crossover fitment for late R, RL, and RS 45" models starting in 1932.
Fitment Exceptions and Variations
- Early 45" Models (1929–1931): These early models typically used a different valve with a smaller 1-1/8" head diameter and are not compatible with the 18070-32 unless the seats have been modified.
- Intake vs. Exhaust: While officially designated as an intake valve, many high-quality aftermarket replacements (such as those from V-Twin Manufacturing) are manufactured from materials that allow them to be used as interchangeable intake and exhaust valves.
- Oversize Seats: If your engine has undergone multiple rebuilds, you may need the 1/8" oversize version of this valve to properly seal worn seats.
Please make sure of fitment before buying.
NOS, open for pictures.
Selling as pictured, save on shipping by coming to store in Butler, PA
031626 CC