I'm fairly certain that Trooper MK III hammers and related parts were made from forged steel and NOT a sintering process.
As for the reference to the Chevrolet small block V-8 timing gear, that is flat out incorrect. They were plastic teeth molded onto a metal center section. Clearly cheaper to mass produce but not as durable as steel gears. Not "powdered metal" but not all that great in any event. That was not one of General Motors finer engineering moments.