The F4.6 V2 features a new crankcase and heat sink design with larger heat sink fins for improved cooling. This new design also makes the engine 37G lighter and 12mm shorter. A new pull start utilizes a one-way bearing encased in a large 14mm hex for increased durability.The F4.6 is the Powerplant responsible for the immense speeds and raw torque in the savage x 4.6, and now it's available to fit into any savage or big-block monster truck! It features all the race tuning you could ever want in a big-block monster truck engine, fantastic good looks and plenty of attitude! With 2.9 Horsepower on tap, it really is true that there's no replacement for displacement! With 8-port race tuning, you get a huge power band through the entire rev range, All the way up to 32, 000rpm! The composite 7.5mm carb is heat-resistant for consistent tuning as the engine warms up.