Keith Black 74 Inch FLH-FX Piston Set.010 Oversize

Engineered for authentic restoration and performance upgrades, the Keith Black 74 Inch FLH-FX Piston Set in.010 oversize delivers a precise 3.438 in bore and a 9.0:1 compression ratio for Harley-Davidson FL models manufactured between 1941 and 1950.

Built from forged aluminum for durability and heat resistance, these pistons are made in the USA. The kit is designed to fit early 1940s Harley FLs, enabling a restoration that preserves period aesthetics while enhancing engine operation.

• Ring-O-Matic Ring Compressor Tool Kit
• Connecting Rod Clamping Tool
• Piston rings

Installation and break-in: Proper installation and break-in procedures are critical; run the engine at moderate speeds for at least 500 miles to seat the pistons and rings. For installation guidance, refer to the official instructions provided with the product.

Part number KB263.010.

Keith Black 390 hypereutectic piston set is.010 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.

Upgrade your Harley Davidson FL with the Keith Black 74 inch FLH-FX piston set, designed to deliver reliable performance and precise fitment. Crafted in the USA, this set is ideal for restoring or enhancing vintage Harley models from 1941 to 1950. The pistons feature a durable construction that ensures longevity and efficient engine operation. Proper installation and break-in procedures are critical; run the engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears to properly seat the new pistons and rings. For installation guidance, refer to the official instructions available at this link. The package includes essential accessory items such as a Ring-O-Matic Ring Compressor Tool Kit, Connecting Rod Clamping Tool, and a set of oversize piston rings, ensuring you're fully equipped for a professional installation. The pistons are designed to fit Harley Davidson FL models from the early 1940s, providing an authentic restoration experience or a performance upgrade. With a focus on quality and precision, the Keith Black pistons are an excellent choice for mechanics and enthusiasts looking to maintain the classic Harley aesthetic while benefiting from modern performance enhancements.

Features:

• Fitment: Compatible with 1941-1950 Harley Davidson FL models

• Material: High-quality forged aluminum for durability and heat resistance

• Oversize:.010 inch for increased engine performance and bore size

• Country of Origin: Made in the USA for quality assurance

• Included Accessories: Ring-O-Matic Ring Compressor Tool Kit, Connecting Rod Clamping Tool, and piston rings

• Installation Note: Run engine at moderate speeds for at least 500 miles during break-in period to ensure proper seating of pistons and rings

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