controlline,
You fly C/L and you don't know that the venerable Fox Stunt .35 is still made with a cast iron piston and steel sleeve? Your Fox .15's are old but the modern one is also cast iron and steel sleeve. As are many of the smaller Fox engines both R/C and C/L. The lower priced Enya's are also. Other than a few low production engines (I recall some made specifically to fit a scale model) that is about it.