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Cylinder set by Cannonball; fits Flathead Big Twin 1937-1948; cast iron, cast finish; length: 156 mm; nominal bore: 3-7/16 ”; inner Ø: 85.00 mm; replaces OEM 16473-37, and 16474-37; Germany; gross weight: 20.9 kg

Make your old trusty Flathead mill run again as if shot from a cannon. These authentic reproductions of the highly sought after 80 cui. cylinders spell relief for all Flathead owners with their bikes’ cylinders bored out way beyond safe limits. And there’s more good news: since all Big Twin Flatheads of the 1937 thtru 48 year group feature the same 4-9/32” stroke, these 3-7/16” bore cylinders will hop up any 74 cui. mill (stock 1941 thru’ 48) to a full 80 cui. What a blast! Precisely made to the last detail with 11-fin design and stock-like markings for a period correct appearance. Metallurgy has made some progress since the 1930s, so the Cannonball cylinders are cast from state-of-the-art gray iron for superior durability. Sold as a set, front and rear, with unmachined, hardened valve seats installed so you can safely run your scooter on unleaded fuel.

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Cylinders which are not offered as complete kits, i.e. with pistons and rings, are not finish honed. This job must be performed in a qualified workshop.
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* United States of America: Tax free shipping. Please check your local import fees.


See also:

  • Cannonball Big Twin Flathead Crankcases

    Cannonball Big Twin Flathead Crankcases Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and ...

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