RE: O.S. .32 conversion
The 32SX ABN airplane and the heli ringed type are the current versions. They are high performance the way they are.
It's been rumored that they were coming out with a 37 for years but it has never happened,
It may be possible that the sleeve and piston from a Chinese Magnum/ASP 36 or from a LEO/Mecoa/Megatek 32/37 will fit? All these engines look the same.