I would pretty well doubt that it is, it's been a few years since they were out. The F11 engine is a 7 intake ports and 1 exhaust port engine, similar to the old WS7 engine, but the WS7 had different crank, the C6 is a 7 intake ports and 3 exhaust ports, the B11 is pretty much a revised C6, and quite reasonable fuel mileage.