ARC 4.000 Inch Enduro Billet Rod for High-Stroke Kart Engine BuildsStroker enthusiasts, take note: the ARC Billet Rod 4. 000" Enduro opens up new realms of power in your Raptor Flathead setup. By extending stroke length, it increases engine capacity without major overhauls, delivering the torque surge needed to blast out of corners and hold leads. This enduro variant prioritizes durability for stroked configurations, where stresses multiply. The 4. 000 inch length pairs with longer pistons for volumetric efficiency