1937 Knucklehead Head Set - V-Twin 10-1640

1937 Knucklehead head set is accurately cast with the original factory markings for the 61 inch models and features a black finish. The heads include 61 inch intake nipples that are installed.

Uses 1-3/8 inch large hex 18mm plugs. *NOTE: Valve seats are installed.

Notes:

• Suggested to use with 18mm Doering Spark Plug Set.

Fitment:

Installation instructions (PDF)