Water Walker is machining and marketing the strongest mounts made. They are for Chevy engines but the rear mounts can be used for just about anything including aircraft. They where developed by Lonny Tucker of Outback Adventures for the super high horsepower motors that his customers require. For those that don't know Lonny, he builds the BADDEST,MEANEST buggys , pull trucks, and airboats around. With NO motor mount failure or even stretch. An engine must be able to move but must also be contained.
I will get pictures and details.
Chris Chardt took some photos of the prototype, maybe I can get him to post.
Bob
p.s. They can be made of mild steel, stainless, or aluminum.