Big Port "Aluminum" KNUCKLE HEADS (Bare) OEM 1940 - 1947 Knuckle motor style These Special replica stock type HEADS can be used with all original Knuckle Head components HEADS use standard 1-3/4" dia. Valves, 18mm Spark Plugs & Plumber Manifold Hard Valve Seats (unfinished) & Heli-Coil Head Bolt Inserts Advantage of Light Weight & Cool Running Front Head 6 lbs 6 oz lbs - Rear Head 5 lbs 7 oz RAW finish
Big Port "Aluminum" KNUCKLE HEADS (Bare) OEM 1940 - 1947 Knuckle motor style These Special replica stock type HEADS can be used with all original Knuckle Head components HEADS use standard 1-3/4" dia. Valves, 18mm Spark Plugs & Plumber Manifold Hard Valve Seats (unfinished) & Heli-Coil Head Bolt Inserts Advantage of Light Weight & Cool Running Front Head 6 lbs 6 oz lbs - Rear Head 5 lbs 7 oz RAW finish
