Motortechnic 1938-1939 EL Knucklehead Cylinder Head Set — Small Intake Port

The Motortechnic Bare 1938-1939 EL Knucklehead Cylinder Head Set with a small intake port delivers precise airflow tuning for Harley-Davidson EL models from 1938 and 1939, featuring exact casting marks and details faithful to the original 61-inch Knucklehead design.

Built from tempered material for superior heat resistance, this head offers hardness of 370–415 HB and tensile strength of 1250–1400 N/mn2, delivering durable performance under vintage-engine operating conditions. The small intake port is engineered to optimize airflow for enhanced throttle response and mid-range performance on classic setups.

Fitment and notes: Harley-Davidson EL 1938 and 1939. The set is bare (no valve springs or valve cover) but is compatible with cup valve cover primer caps and large 18mm air-cooled spark plugs. Installation is straightforward with suggested accessories available separately:

• #42-3637 Lower Valve Spring Cup Set Parkerized
• #49-0009 Brass Head Primer Cups
• #49-0878 18mm Doering Spark Plug Set

Additional accessory items that complement this cylinder head include a 61-inch Pushrod Cover Kit, a 1937-1938 EL Knucklehead Bare Cylinder Head Set, and a Lower Valve Spring Cup Set Parkerized. All items are sourced from Germany, reflecting Motortechnic’s emphasis on precision manufacturing and quality control for restoration or performance projects.

1938-1939 EL bare Knucklehead cylinder head set features exact casting marks and details for 1938 61 inch Knucklehead models.

The Motortechnic Bare 1938-1939 EL Knucklehead Cylinder Head Set offers a reliable upgrade for vintage Harley Davidson models. Designed with a small intake port, this set is crafted from high-quality tempered material that provides superior hardenability and heat resistance. Its high tensile strength, ranging from 1250 to 1400 N/mn2, and hardness levels between 370 and 415 HB, make it a durable choice for enthusiasts seeking performance and longevity. This cylinder head set is suitable for Harley Davidson EL models from 1938 and 1939, ensuring a proper fit for classic restoration or performance enhancement projects.Installation is straightforward with suggested accessories such as the #42-3637 Lower Valve Spring Cup Set Parkerized, #49-0009 Brass Head Primer Cups, and #49-0878 18mm Doering Spark Plug Set, all available separately. The set does not include the valve spring cover but is compatible with cup valve cover primer caps and large 18mm air-cooled spark plugs, making it versatile for various configurations. The material's toughness and high tempering resistance contribute to improved durability under demanding conditions, ensuring your engine maintains optimal performance over time.Additional accessory items that complement this cylinder head include a 61-inch Pushrod Cover Kit, a 1937-1938 EL Knucklehead Bare Cylinder Head Set, and a Lower Valve Spring Cup Set Parkerized, providing a full range of components for a comprehensive upgrade or rebuild. All items are sourced from Germany, reflecting the high manufacturing standards and quality control. For detailed installation instructions, visit this link. Whether restoring a vintage Harley or enhancing performance, the Motortechnic Bare 1938-1939 EL Knucklehead Cylinder Head Set is an excellent choice for discerning motorcycle enthusiasts.

Features:

• Small intake port for optimized airflow

• High-quality tempered material with superior heat resistance

• Hardness: 370-415 HB for durability

• Tensile strength: 1250-1400 N/mn2 for toughness

• Compatible with cup valve cover primer caps and large 18mm spark plugs

• Includes necessary accessories for installation

Fitment:
Harley Davidson EL 1938
Harley Davidson EL 1939