Variable Valve Timing and Lift Electronic Control.=(VTEC) some upper spec honda cars have them. They usually have a minor power advantage over a non vtec honda engine. At higher revs if the honda is a DOHC it kicks in a second cam at higher revs allowing the engine to get a shot of extra power much like a turbo. You can see this on you tube by searching Vtec. A V8 is still a better drag car with much more torque and better take off.