Beautifully machined engine and components you can count on top performance on the track. High Torque Off-Road Buggy Engine Tremendous Bottom end with super Mid-High and high end speed! Here are some specs: Displacement: 3.5cc (.21 ci ) Horse Power: rated 3.07 hp RPM: 35,000. This Italian stallion is a true work horse in the realm of off-road 1/8th scale competition engines. You will be amazed by the fine detail of this engine all Italian made superior quality metals used. Same specs as the Radical 621T. Engine requires turbo glow plug. Brand new Cinderella cooling head design provides enhanced cooling and aerodynamics. Enhanced carburetion provides better fuel economy. Same internal engine parts that took 2nd and 4th at the Brazilian NATS 2012. I'm telling you guys with the recent drop in the Euro it is time to give the OPS line a try. We guarantee you will love our OPS engines. Everything seen in the picture is what you get! This is the Off-Road SFV-21B HIGH TORQUE version of the 621 line of OPS engines. Note the tear drop porting on the sleeve! Comes with Venturi carburetor 6,7,8mm inserts. Manufactured by OPS in Italy.