Engine & Transmission

Everyone wants to make big power and this page is where the magic happens. Fuel, air, and spark make pistons move, the crank turn, and wheels spin.

At Billet Proof we carry the best brands to keep your Flathead, Knucklehead, Panhead, Shovelhead, Evolution, Twin Cam and M8 running strong. On a budget, start small and make sure that engine is inhaling well with a new Big Sucker air cleaner kit from Arlen Ness. You can never go wrong with a chain conversion kit. If you’re making big power, the factory drive belt isn’t going to cut it for long. We offer several kits at different price points. Need cooler engine temps? We offer several bolt-on oil coolers that will keep that air cooled engine operating for years. We also offer a very cool hydraulic clutch conversion for you Harley Ironhead guys. You’ll never have to worry about all the annoying issues associated with Ironheads and the clutch with our Hydro Clutch. Need parts to pretty up your ride? Check out our finned cam covers or oil line kits from Old STF. Don’t see the aftermarket motorcycle engine and transmission parts you’re looking for? Please call in by using our direct line (484) 652-8010. We will match any competitors' advertised price.