49-1345 - 1939-1940 EL Knucklehead Cylinder Head Set Assembly Black

Assembled cylinder head set is an accurately reproduced black finish front and rear heads for 1939-1940 EL 61 Knuckleheads.
Includes black head set valves springs collars parkerized lower covers parkerized upper covers rocker arms rocker boxes and intake manifold nipples completely assembled and ready to be installed. Uses 1-3/8 large hex 18mm plugs. *NOTE: Heads include feature detailed casting hallmarks as original black painted. *NOTE: Accepts large 1-3/8 hex Doering #3 spark plug set. *NOTE: Material of valve seats features a better hardenability and heat resistance than 1.2713. Material is tough with high compressive strength and high tempering resistance. Hardness equals 370-415 HB. Tensile strength equals 1250-1400 N/mn2. Condition is tempered.

Fits:
EL 1939-1940

UOM: SET
Country Of Origin: GERMANY

Suggested Items:
11-0879 - Knucklehead Rocker Arm Shaft Set
49-0009 - Brass Head Primer Cups
42-6174 - Lower Valve Spring Cup Set Parkerized
49-1310 - 1937-1938 EL Knucklehead Bare Cylinder Head Set
11-0644 - Upper Valve Collar Set
11-0647 - Lower Valve Collar Set
11-9623 - Valve Keeper Keys
11-9641 - Nitrate Intake Valve
11-9643 - Nitrate Exhaust Valve
11-0025 - Knucklehead Rocker Arm Set

Accessory Items:
11-0904 - Pushrod Cover Kit
42-3637 - Lower Valve Spring Cup Set Parkerized
49-1349 - 1939-1940 EL Knucklehead Cylinder Head Set with Valve
49-0009 - Brass Head Primer Cups

Tech Notes: Suggested to use with #49-0878 18mm Doering Spark Plug Set. Suggested to use with #49-0878 18mm Doering Spark Plug Set.