Bare 1938-1939 EL Knucklehead Cylinder Head Set
Features a small intake port. The valve spring cover is not included. *NOTE: Accepts cup valve cover primer caps and large 18mm air cooled spark plugs all items available separately. *NOTE: Accepts large 1-3/8 inch 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.
Tech Notes: Suggested to use with #42-3637 Lower Valve Spring Cup Set Parkerized. Suggested to use with #49-0009 Brass Head Primer Cups. Suggested to use with #49-0878 18mm Doering Spark Plug Set.
Instructions: http://www.vtwinmfg.com/Instructions/49/49-1349.pdf
FITS
Harley Davidson EL 1938
Harley Davidson EL 1939
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