There are probably only a few producers of piston castings for the 261, with a lot of people doing the finish machining and putting their own name on the box. When I worked at Armstrong Robber Co. we produced 4 brands of tires, using the same molds, rubber compounds and curing times- - - -we just changed the label inserts in the molds for "different" brand names.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!