Aftermarket connecting rods come in various designs, materials and lengths. Picking the right combination will ultimately come down to these five key factors… • Engine performance or output—as in horsepower, torque and rpm range • Engine dimensions: this includes piston height and crankshaft stroke • Application: street, drag race, endurance racing, etc. • Piston weight • Your budget All of these factors will help determine the rod length, material and configuration that’s best for your application.