S&S Cycle 74 Inch Overhead Valve Forged Piston Set for Harley-Davidson FL (1941–1950)

Upgrade your vintage Harley‑Davidson FL with a forged piston set designed for authentic performance and durability. The bore is 3-7/16 inch (standard size), and the pistons are machined to fit 4-3/4 inch or 4-5/8 inch stroker flywheels for precise alignment with your engine’s crank and rods.

• Material: Forged aluminum for increased strength and longevity
• Displacement/bore: 74 inch piston set with standard 3-7/16 inch bore
• Compatibility: Harley-Davidson FL models from 1941 to 1950 (FL series)
• Includes: Pistons, rings, wrist pins, and retainers
• Manufacturing: Made in the USA
• Fitment: Machined to fit 4-3/4 inch or 4-5/8 inch stroker flywheels

Designed for restoration or performance upgrades, this forged piston set delivers a precise fit and reliable operation in classic FL engines.

Installation notes: online installation and break-in instructions are available. Break-in guidance recommends running the engine at moderate speeds for at least 500 miles to properly seat pistons and rings, while avoiding excessive running in lower gears during break‑in.

S&S forged piston set 3-7/16 inch bore is standard size. Set includes rings wrist pins and retainers. Machined to fit 4-3/4 inch or 4-5/8 inch stroker flywheels.

Upgrade your Harley Davidson FL with the S&S Cycle 74 Inch Overhead Valve Forged Piston Set, designed for authentic performance and durability. Crafted in the USA, this piston set is engineered to meet the high standards of vintage Harley Davidson engines, ensuring a precise fit and reliable operation. The forged construction provides enhanced strength and longevity, making it suitable for both restoration and performance upgrades. The set includes pistons that are compatible with Harley Davidson models from 1941 to 1950, specifically the FL series, offering a straightforward installation for experienced mechanics and enthusiasts alike.

Features:

• Material: Forged aluminum for increased strength and durability

• Compatibility: Fits Harley Davidson FL models from 1941 to 1950

• Size: Standard 74 inch bore for authentic restoration or performance upgrades

• Country of Origin: Made in the USA ensuring quality and reliability

• Installation Notes: Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears to properly break-in new pistons and rings

• Included Instructions: Available online for proper piston installation and break-in procedures

• Suggested Items: 11-0176 - 74 inch FLH Piston Ring Set Standard

• Accessory Items: 16-0622 - Ring-O-Matic Ring Compressor Tool Kit, 16-0029 - Connecting Rod Clamping Tool, 60-0167

Fitment:
Harley Davidson FL 1941
Harley Davidson FL 1942
Harley Davidson FL 1943
Harley Davidson FL 1944
Harley Davidson FL 1945
Harley Davidson FL 1946
Harley Davidson FL 1947
Harley Davidson FL 1948
Harley Davidson FL 1949
Harley Davidson FL 1950
Harley Davidson FL 1951
Harley Davidson FL 1952
Harley Davidson FL 1953
Harley Davidson FL 1954
Harley Davidson FL 1955
Harley Davidson FL 1956
Harley Davidson FL 1957
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
Harley Davidson FL 1965
Harley Davidson FL 1966
Harley Davidson FL 1967
Harley Davidson FL 1968
Harley Davidson FL 1969
Harley Davidson FL 1970
Harley Davidson FL 1971
Harley Davidson FL 1972
Harley Davidson FL 1973
Harley Davidson FL 1974
Harley Davidson FL 1975
Harley Davidson FL 1976
Harley Davidson FL 1977
Harley Davidson FX 1971
Harley Davidson FX 1972
Harley Davidson FX 1973
Harley Davidson FX 1974
Harley Davidson FX 1975
Harley Davidson FX 1976
Harley Davidson FX 1977