RE: McCoy engines
loughbd:
Wrong on the date? I'll allow that, but you are wrong about the ABC engine. The RINGED K&B 61 is still in production, and all the mechanical parts still interchange. Carb? The carbs were obviously different in the two pictures I posted.
The Veco 61 and the current K&B 6550 engines are still the same.
There is one internal difference that has no effect on parts interchange. The earliest Vecos had a plain skirted piston, but before K&B took over the design auxilliary bypass ports were cut in the piston skirt, with matching ports in the cylinder sleeve. Adn one more - the earliest Vecos had a Dykes ring. See picture.
But the sleeves and pistons still fit one to the other.
Bill.