Harley Big Bore 3-5/8 Cylinder Jugs Pair 3.61 3.62 Bore 80806B 80811A

Pair of Harley-style big-bore cylinder jugs measuring approximately 3.61 inches and 3.62 inches at the bore. The cylinders are in very nice overall condition with no broken fins or obvious damage found during visual inspection.

Part Number / Markings: 80806B / 80811A markings
Condition: Used – Very Good / No Broken Fins Seen

DETAILS: Measured bore sizes are approximately 3.61 in and 3.62 in, placing these in the 3-5/8-inch big-bore family. A nominal 3-5/8 bore is 3.625 inches, so final bore size, taper, out-of-round, and piston clearance should be checked with precision machine-shop equipment. The 80806B and 80811A markings could not be reliably tied to a specific manufacturer catalog during research.

USED PARTS DISCLAIMER: This is a used motorcycle part and may show normal signs of age, installation, removal, storage, and previous use, including scratches, scuffs, discoloration, surface corrosion, paint loss, oxidation, or other cosmetic wear. Any known damage or defects are noted when known. Unless otherwise stated, the photos show the actual item being sold and are considered part of the description.

FITMENT NOTES: 3-5/8-inch big-bore cylinders were used in a number of Harley and aftermarket performance combinations, including S&S big-bore builds. Do not assume exact Evo, Shovelhead, displacement, or manufacturer fitment from bore alone. Verify cylinder height, base spigot diameter, head bolt pattern, oil-drain locations, front/rear orientation, case machining requirements, piston design, and stroke before purchase.

FITMENT: Buyer is responsible for verifying fitment before purchase. Fitment information is provided as a reference based on available part numbers, casting marks, bore measurements, and published references. Engines may have been modified over time, so compare part numbers, combustion chamber, valve configuration, bore, cylinder height, base spigot, mounting points, and photos with your existing engine components.

QUESTIONS? Send us a message before purchasing if you need additional measurements, photos, condition details, or clarification on what is included.

SHIPPING: Orders are typically processed and shipped within 1–2 business days after payment. Tracking is provided once the order ships. Engine parts are packed carefully according to their size and weight.