The 3-7/16 inch bore is the standard size for vintage Harley-Davidson ULH engines and is specifically tuned for 80-inch ULH models from 1937 through 1946. Each piston in this Eastern set features a steel expansion control strut cast into the body, providing improved durability and heat resistance under high-rpm or long-distance riding conditions.

The kit includes all components needed for a complete rebuild or upgrade: a full ring set, two wrist pins, and four circlips. This ensures proper piston fitment and reliable valve train operation with the correct bore and clearance.

• Bore size: 3-7/16 inches (standard size for ULH replacements)
• Material: cast steel construction with integrated expansion control strut
• Includes: complete ring set, two wrist pins, four circlips
• Fitment: Harley-Davidson ULH models 1937–1946
• Origin: assembled in the USA
• Suggested pairing: wrist pin locks, gasket sealants, and installation tools for best results

Whether restoring a classic ULH or maintaining a vintage engine, this piston set provides the authentic dimensions and durable construction needed to sustain performance and longevity.

Piston set 3-7/16 inch bore is standard size. Set includes ring set 2 wrist pins and 4 circlips. Pistons have a steel expansion control strut cast. For 80 inch models.

This Eastern 3-7/16 inch piston set is designed for precise fitment in vintage Harley Davidson ULH models from 1937 to 1946, ensuring optimal engine performance. Each piston features a robust steel expansion control strut cast into the body, providing enhanced durability and heat resistance during high-performance riding. The set includes a complete ring set, two wrist pins, and four circlips, offering all necessary components for a comprehensive rebuild or upgrade.
Constructed with quality materials, these pistons are built to withstand the rigors of daily riding and long-distance cruising. The standard bore size of 3-7/16 inches makes these pistons an ideal replacement part for restoring or maintaining classic Harley Davidson engines. Assembled in the USA, this kit guarantees reliable performance and compatibility with vintage Harley models from the late 1930s through the mid-1940s.
For optimal installation, consider pairing this piston set with recommended accessory items such as wrist pin locks, gasket sealants, and specialized tools. Proper installation will ensure efficient engine operation, improved power output, and extended engine lifespan. Whether you are restoring a vintage bike or performing routine maintenance, this piston set offers a dependable solution for maintaining the authenticity and performance of your Harley Davidson ULH engine.

Features:

• Bore Size: 3-7/16 inches, standard size for vintage Harley Davidson ULH models

• Material: Steel cast control strut for durability and heat resistance

• Includes: Complete ring set, two wrist pins, and four circlips for comprehensive installation

• Country of Origin: USA, ensuring quality manufacturing standards

• Recommended Accessories: Piston wrist pin locks, gasket sealants, and installation tools

Fitment:
Harley Davidson ULH 1937
Harley Davidson ULH 1938
Harley Davidson ULH 1939
Harley Davidson ULH 1940
Harley Davidson ULH 1941
Harley Davidson ULH 1942
Harley Davidson ULH 1943
Harley Davidson ULH 1944
Harley Davidson ULH 1945
Harley Davidson ULH 1946
Harley Davidson ULH 1947
Harley Davidson ULH 1948