ABOUT US NEWS & EVENTS DEALERS CONTACT Close DIAMONDBACK Specs & Features PDF ENGINE: Viper all billet 152 cubic inch short stroke, dry sump with external oil lines utilizing oil-in-the frame technology. Viper EPA certified engine produces 144 ft/lbs torque at 3000 RPM. Viper (Hemi) head design utilizes twin plug firing generating 20% less heat than the competition.