Motortechnic 1937-1938 EL Knucklehead Bare Head Set

Exact-fit bare cylinder head set for the 1937 Harley-Davidson EL, with compatibility to 1938 EL models, designed for restoration or authentic custom builds while preserving original styling and compatibility with period components.

• Includes intake manifold springs, valves, collars, spring cups, and top tins for complete assembly
• Castings feature detailed original hallmarks and a durable black paint finish
• Made from hardened, heat-resistant material with high compressive strength
• Hardness 370–415 HB; tensile strength 1250–1400 N/m²
• Accepts large 1-3/8 inch hex Doering #3 spark plugs; compatible with 18mm Doering Spark Plug Sets
• Valve seats installed but not cut, allowing precise customization during assembly
• Instructions for installation are available online
• Crafted in Taiwan

This head set is suited for restoring or building vintage Harley engines, providing an authentic foundation that supports period-correct performance. Compatible accessory items include rocker arm shaft sets, rocker shaft end nuts, lower valve spring cups, and replica rocker boxes to complete the engine package.

1937-1938 EL bare Knucklehead head set features OEM production numbers mc hallmark small intake port primer black plugs manifold nipples and are painted with black heat paint.

Designed specifically for 1937 Harley Davidson EL models, the Motortechnic 1937-1938 EL Knucklehead Bare Cylinder Head Set offers authentic fit and function for vintage motorcycle restoration or customization. This set is compatible with 1937 models and can be used on 1938 EL models, ensuring versatility for enthusiasts working on early Harley Davidson engines. The heads come with detailed casting hallmarks as original and are finished with a durable black paint, giving a classic appearance while maintaining structural integrity.
This head set includes top-quality components such as intake manifold springs, valves, collars, spring cups, and top tins, all assembled for easy installation. The material used for the valve seats features enhanced hardenability and heat resistance compared to standard 1.2713 material, providing high durability under demanding conditions. Hardness ranges from 370 to 415 HB, with tensile strength between 1250 and 1400 N/m2, ensuring long-lasting performance.
The heads accept large 1-3/8 inch hex Doering #3 spark plugs and include features suitable for use with 18mm Doering Spark Plug Sets, making them an excellent choice for maintaining original specifications or upgrading performance. Valve seats are installed but not cut, allowing for precise customization during assembly. Instructions for installation are available online, ensuring proper setup for optimal engine operation.
Crafted in Taiwan, these heads meet high manufacturing standards and are ideal for restoring or building vintage Harley Davidson engines. Compatible accessory items include rocker arm shaft sets, rocker shaft end nuts, lower valve spring cups, and replica rocker boxes, all designed to complement this cylinder head set and ensure comprehensive engine assembly. This set provides a reliable foundation for preserving the authenticity and performance of classic Harley Davidson EL engines.

Features:

• Exact fit for 1937 Harley Davidson EL, compatible with 1938 models

• Includes intake manifold springs, valves, collars, spring cups, and top tins

• Made from hardened, heat-resistant material with high compressive strength

• Accepts large 1-3/8 inch hex Doering #3 spark plugs

• Detailed original casting hallmarks with black painted finish

• Designed for easy installation with included instructions

• Suitable for restoration or custom builds of vintage Harley engines

Fitment:
Harley Davidson EL 1937
Harley Davidson EL 1938