That is great news. MRC did such a poor job of promoting the Enya line. I am very partial to Enya engines, and have been since I bought my first 29 IV BB and 35 III BB in the PX in the Spring of 66. I wish you all possible success in selling the Enya engines.
Pat 
Cool Randy,
That .53 4C might have real merit. Way, way back I flew the original Imitation for several years with the Enya .46 4C that (based on later experience) appears to have been built on the same case as the .46. I'll tell you how far back that was, the airplane that I won the '86 Nats with was built specifcally for that engine because I liked it so much on the Imitation. Of course, I screwed up by putting a brand new .46 with a different prop on the new airplane and it didn't pan out too well. Ended up with an ST .46 and a bunch of lead in the (short) nose when it won the Natss.
Wow, that means I was flying four stroke in the early '80s! Holy cow. I was almost a trail blazer. I could'a been ... oh, never mind.
My point is that, had I known then what I know now about props and tanks for four strokes, I've no doubt I could have made the .46 work great in that airplane. The same case with the larger displacement might be terrific. I've still got the airplane, pretty beat up and with a Randy Smith VF .46 and pipe in it (probably all gummed up by now). MIght be fun to stick the .53 in it and see what happens.
Hmmmmm
Ted