I am not sure I would get hyped up about not being able to buy one of these engines..they are a stock OS Speed with a few cosmetic dremel cuts done by hand on the sleeve and crank. There is nothing physically done that would improve the performance of these engines over stock, i would even suspect some of the dremel work may have a negative impact...other then the pretty blue head this is just a basic OS speed with some cosmetic hand dremel work done to it.