Replica Harley-Davidson Big Twin Engine Cases | Street Chopper
W&W Cycles

Replica Harley-Davidson Big Twin Engine Cases

OEM-style cases for Flathead, Knucklehead, and Panhead motors

If you want the style of a Harley-Davidson Panhead, Knucklehead, or even a Flathead motor without all the hassle of restoring and maintaining the real deal, the aftermarket has a nice selections of replica crate mills ready and waiting for your next project. But if you want the genuine article, I'm sorry, you'll most likely spend a ton of time, a ton of money, or both for the real deal. If that's you, then keep reading.

Working old stock parts are, depending on the vintage, can be extremely rare. Even if you locate the parts you need on the bottom of a soggy cardboard box long forgotten in some old-timer’s barn, there's no guarantee those parts are in good working order, or even usable. Even the well preserved specimens have been around for a long time, and some just didn’t age well. The sellers are usually in the know about the rarity of the part, which doesn’t make finding a realistic price any easier to boot.

That’s why W&W Cycles now carries Cannonball parts and components.

Harley-Davidson replica OEM Flathead cases

Flathead casings being prepared for new homes. Please help.

W&W Cycles

Cannonball is now making parts for the classic engine generations Flathead, Knucklehead and Panhead. Here are authentic reproductions ranging from engine cases, cylinder heads, cylinders, oil pumps to innards such as lifter blocks, camshafts and timing gear sets.

All this is being precision manufactured to the stock tolerances in Germany. The materials now used were the stuff of dreams in the old days, when Flatties, Knucks and Pans were rolling out of Milwaukee.

Harley-Davidson replica OEM Knucklehead cases

Here, we see the Cannonball OEM-style Knucklehead parts deployed on an actual project.

W&W Cycles

But, as indicated earlier, using these parts means necessitates a profound technical knowledge or the help of an engine shop.

Cannonball is a homage to the legendary record runs of Erwin George “Cannonball” Baker, who in 1914 thundered across the continental USA coast-to-coast in by then hard-to-believe 11 days.

Because an engine thunders but gets nowhere all on its own, Cannonball also has in stock further components for V-twins just like out of a time machine. There’s leaf spring forks, handlebars, WR-style tanks, mag wheels, brakes, and fenders. More reproductions and special parts are scheduled for the future.

Harley-Davidson replica OEM Flathead cases

Flathead chopper employing Cannonball replica cases.

W&W Cycles

All parts have been tested and refined under everyday and not-so-everyday conditions before they went into production. True to their old motto at W&W: “we ride what we sell”.

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 bushing which are line bored and lapped for standard rollers. Cam bushings are already in place, too, reamed to standard size.

Harley-Davidson replica OEM Panhead cases

Inside view of the Harley-Davidson OEM knockoff for Panhead motors

W&W Cycles

The selection includes cases with a smooth, uniform glass bead blasted finish and cases with an NOS (new old stock) finish. The latter means the finished cases are not bead-blasted but treated in a traditional process which gives them the appearance of new factory cases that had been sitting on the shelf for 50 years. Perfect for those "patina restorations".

All cases feature laser-engraved CB production numbers, which are registered and filed. Check the availability of Cannonball parts at