I bought 2 Thunder Tigre .36 from Ken Scott at Graceland hobbies in Selma Al. Years ago Ken sent these engines off to be modified for stunt. He doesn't remember where or who. They have not been run. They both have a "10" stamped on the bottom of mounting lug and they have a venturi machined from a black plastic looking material. The needles are of the super tigre style and the needle threads into the locknut as well as the valve body. Anybody have any idea who might have done these? Nick