uliner and cutaway...

One of the Alrdich/? designed Fox 40s was a hefty sandcast, rear exhaust, schneurle. The cooling fins on the upper part of the casting were very shallow. Great engine in some ways, but never caught on. Heard it wasn't as powerful as several of the other 40's of its era. It may also have come in a 36 size, with an optional muffler that fit between the mounts, behind the engine...

That was a schneurle layout - flat top piston, no fence baffle. So was the "first" Fox schneurle, another 40, had a smooth, drop-in sleeve, cooled by an aluminum cuff between the head and the lower crankcase. The lower case only came up as high as the top of the exhaust stack. This one had a VERY long mount bolt spacing, fore and aft, too.

I do believe there was a CL version of the baffle piston Fox RC 40 of the late 60's. It looked more like a round venturii Combat Special than the 35 Stunt, and did have many more head fins, as did the Combat Specials. If I recall, the venturii stack had a short section right at the opening which rolled out like a very short trumpet bell. Again, the age was not supportive of some engines gaining a reputation, either way.

Most Fox engines I've used and seen gave good service at the cost of some time and effort when they were new. Other engines don't need as much TLC at the beginning, and are/were usually much prettier to look upon.