These MMR Piston Pins are made from a Proprietary material stronger than ANY currently available H-13 Tool steel or 9310 Chromoly. Suggested for all applications up to 3500HP!! Thick wall design prevents flex and greatly increases strength. 2.500" Long for most stock and aftermarket pistons. Fits: Coyote Applications 4.6 and 5.4 Applications Select your Pin size and lock type below: