Motorshop Flatside 74 Inch Long Block Engine For Harley FL 1958-1964

The Motorshop Flatside long block is a fully assembled, factory-tested engine replacement for Harley Davidson FL motorcycles built between 1958 and 1964. It ships ready for installation and is pre-run to verify oil pressure.

• Displacement: approximately 74 cubic inches
• Oil pump and breather assembly: Sifton oil pump and breather
• Flywheel: Stock stroke flywheel
• Bearings: Timken bearing
• Camshaft: Stock lift FLH cam with matched pinion and cam gear
• Torrington bearing: Included
• Cylinder and piston: 8.5:1 compression, cast pistons and rings
• Distributor: Clamp-style automatic advance for improved ignition timing
• Finish: Natural flatside cylinder heads and polished rocker boxes with tappets and pushrods
• Testing: Factory-tested for oil pressure
• Fitment: Harley Davidson FL 1958–1964

Note: This long block does not include a carburetor or manifold; these components must be ordered separately. The assembly is shipped fully assembled and ready for installation, and includes a Manufacturer’s Statement of Origin for registration purposes.

Whether restoring an original bike or building a custom ride, this long block provides a dependable, period-correct foundation for Harley Davidson FL models from 1958 to 1964.

Assembled and tested for oil pressure.

The Motorshop Flatside Shovelhead 74 inch long block engine offers a reliable and powerful upgrade for Harley Davidson FL models from 1958 through 1964. Crafted in the USA, this engineered assembly delivers approximately 74 cubic inches of displacement, making it an ideal choice for enthusiasts seeking a classic yet dependable performance boost. The long block includes a Sifton oil pump and breather assembly, ensuring optimal oil flow and engine longevity. Featuring a stock stroke flywheel and Timken bearing, this engine provides smooth operation and durability for daily riding or custom builds. The stock lift FLH cam, matched pinion, cam gear, and Torrington bearing work together to deliver a balanced performance that stays true to the original design, while the cylinders with 8.5:1 standard compression, cast pistons, and rings contribute to consistent power output. Included with the assembly is a clamp-style automatic advance distributor, which enhances ignition timing for improved engine response. The natural finish of the flatside cylinder heads and the polished rocker boxes, fitted with tappets and pushrods, provide a classic aesthetic that complements vintage Harley Davidson motorcycles. The entire assembly is pre-run and factory-tested to verify oil pressure, ensuring a straightforward installation process. Please note, this long block does not include a carburetor or manifold—these components must be ordered separately. The engine is shipped fully assembled, ready for installation, and comes with a Manufacturer’s Statement of Origin for registration purposes. Whether restoring an original or building a custom bike, this long block offers a high-quality, dependable foundation for your Harley Davidson FL motorcycle.

Features:

• Displacement: Approximately 74 cubic inches for reliable performance

• Oil Pump and Breather Assembly: Sifton oil pump/breather for optimal lubrication

• Flywheel: Stock stroke flywheel for original feel and compatibility

• Bearings: Timken bearing for durability and smooth operation

• Camshaft: Stock lift FLH cam with matched pinion and gear for authentic performance

• Cylinder and Piston: Stock style with 8.5:1 compression, cast pistons, and rings

• Distributor: Clamp style automatic advance for improved ignition timing

• Finish: Natural cylinder head finish with polished rocker boxes including tappets and pushrods

• Testing: Factory tested for oil pressure, ready for installation

Fitment:
Harley Davidson FL 1958
Harley Davidson FL 1959
Harley Davidson FL 1960
Harley Davidson FL 1961
Harley Davidson FL 1962
Harley Davidson FL 1963
Harley Davidson FL 1964