As they say in their web site:
The Python in one word is the ULTIMATE amphibious vehicle. It is a hot rod on the water, excess of 60 mph water speeds, and a hot rod on the street, mid 12 second 1/4 mile times and 0-60 mph in 4.5 seconds. The engine is based on the famous aluminum LS Corvette power train. Enormous Horsepower!
[Read all about it; http://www.watercar.com/limbo/html/watercar_python.html%5D