RE: .o49 engines by cox
I don't know his secret tricks but the Stage 3 Skyline engine I bought from him runs awesome. Very smooth and consistent for a reedie once it finally broke in. I know he lightened the piston and modified the venturi shape a bit. Has one of his custom turbo plug heads on it as well. Piston/cylinder fit feels very tight and it has a nice pop to it when you turn it over by hand. I've never disassembled mine and don't feel the need to do so yet since it doesn't have much time on it. He was making neat stuff. Hope he comes back around in time.