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.

Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and precise fitment. Intended to work with stock or identically constructed engine components. Finished and detailed like the original counterparts so these cases will smoothly blend into your old mill to give it a new life. For ease of installation both case halves are carefully matched and feature pre-installed case bushings, which are line bored and lapped for standard rollers. Cam bushings are already in place and reamed. (For exact measures pls see facts).
All cases feature laser-engraved CB production numbers, which are registered and filed.

Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and precise fitment. Intended to work with stock or identically constructed engine components. Finished and detailed like the original counterparts so these cases will smoothly blend into your old mill to give it a new life. For ease of installation both case halves are carefully matched and feature pre-installed case bushings, which are line bored and lapped for standard rollers. Cam bushings are already in place and reamed. (For exact measures pls see facts).
All cases feature laser-engraved CB production numbers, which are registered and filed.

Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and precise fitment. Intended to work with stock or identically constructed engine components. Finished and detailed like the original counterparts so these cases will smoothly blend into your old mill to give it a new life. For ease of installation both case halves are carefully matched and feature pre-installed case bushings, which are line bored and lapped for standard rollers. Cam bushings are already in place and reamed. (For exact measures pls see facts).
All cases feature laser-engraved CB production numbers, which are registered and filed.

Here is the remedy for Knucklehead, Panhead and Early Shovelhead owners with worn-out or damaged OEM cases. The all new generator style crankcases from S&S! While having an almost stock-like appearance at first glance, the closer inspection yields state-of-the-art design elements that improve overall engine performance and reliability.
Typical features include:
stock-like oiling methods with improved motor scavenging, work with OEM  cast iron oil pumps or S&S oil pumps, fit stock frame, factory installed left and right main bearing races and cam needle bearing, shafts for timer gear and generator drive gear, cylinder base studs, drain plug for thorough engine main-tenance, 1/4”-20 threads used for more readily available hardware, clearanced for long strokes up to 5”, machined for late style generators 58-up,

The guys from S&S did it again. It can be seen bright and clear that the folks from Viola, Wisconsin, know their stuff and actually build engines and not just engine cases. S&S Super Stock crankcases allow complete installation of any flywheel assembly in less than one hour and are designed to meet the needs of modern engine builders. S&S cases come with:
Timken sprocket shaft bearing and races, cam needle bearing pre-installed , pinion shaft main bearing race pressed in and line-honed, pinion shaft bearing ,
Even the cylinder studs are already in place which results in substantial savings in labour. Additional parts supplied include case bolts and crankcase fittings, timing and magnetic drain plugs and instructions.
As stock replacements or all-out racing applications these cases are made for the performance enthusiast. They are cast from 356-T6 heat treated aluminum alloy and additional material has been added to key areas for strength but these improvements do not affect fitting in stock frames. No grinding and special clearancing is necessary. State-of-the-art features like maximized crankcase oil scavenging efficiency and improved oiling methods add up to an overall construction that is hard to beat. Available for 1970-1999 Big Twins. All cases feature the 1992 and newer oil filter mounting bosses. OEM  oil pumps of the respective year group or S&S oil pumps 1981-up are simply bolt on.