This seems to be a fairly new development from ACS. The engines appear to be made from Superior parts. With Superior recently announcing they're back in the market, the timing of ACS offering these engines is probably not a coincidence.
I actually called ACS today as the FAQ section has information about a "Build your engine" link. I guess it's fairly new as it's not on the site yet and they were going to send me the link.
I wonder if they're going to try and compete with Aerosport and the likes?
