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Lower End
Engine Cases
Cannonball Big Twin Flathead Crankcases Kits with Cams and Gear Cover

Crankcases Kit by Cannonball

Item №

The main challenge during restoration and assembly of Flathead engines is the exchange and alignment of the bushings in the right crankcase and the gear cover. Nine bronze bushings need to be installed and line reamed to ensure that four cams and the pinion shaft with its gears turn smoothly. This is a major task and requires several special reamers, which your average workshop does not have. The problem increases when case and cover were not factory matched.

These Cannonball cases for 1937-1948 Big Twin Flatheads feature a pre-fitted gear cover with all bushings and pins installed and are line bored for a set of Andrews cam gears, which are also included. This work is performed in Germany on a coordinate line boring machine, which is superior to reaming. The cover also has its flutter valve and spring-loaded oil separator seal ring installed. All this will cut the working time for the complete engine assembly at least in half and guarantees a quietly running motor, just as if assembled in Milwaukee, provided that the remaining valve train is in good order, too.

  • fits Big Twin Flathead 1937-1948
  • cast aluminum, cast finish
  • with cams and gear cover
  • replaces Harley-Davidson part number 402-37, 584-37, 24515-37, and 25208-37
  • Germany
  • gross weight: 18.8 kg

Quality information re. Cannonball Crankcases.

The W&W Cycles AG selection of Cannonball engine cases are not related in any way in terms of manufacture or distribution to the products of Motortechnic mfg (distributed in the USA by V-Twin mfg/Tedd Cycle Inc., among others).

We have been working for years with three German companies selected by us, who carry out the casting and machining, including the fitting and honing of the bearing races for the crankshaft.

For this reason we grant our own manufacturer's warranty for Cannonball products.

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* United States of America: Tax free shipping. Please check your local import fees.
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