Red, the 6002 .40 is a real keeper. When I got into RC in 1976, my buddy bought a brand new model 6002 .40 Enya as his first engine. This engine was surprisingly strong for a loop-scavenged design, and actually out-revved the then in-vogue O.S. FSR .40 (static revs, both turning Taipan 10x6 props). Admittedly, the OS unloaded much more impressively once in the air but the Enya really surprised a lot of people with its performance.

He still has this engine - it's soaking in fuel after a 27 year lay-off and will hopefully be started soon. I will post his static revs once he bolts on an APC or MA prop for reference.