This is true, Jens.


But I was referring to all the engine manufacturers making F3A engines, from 1980-1985 in the 10 cc bracket....
The OS Hanno Special SF, Webra and YS .61 Long Stroke, for example, are a long stroke engines.

I prefer to use the engine builder's terms of over-square and under-square, to respectively describe engines that have the bore larger than the stroke and smaller than the stroke.