Yup, those are injectors and prechambers from a #14 head. They can be used in a #17 or later head but usually the prechamber has to be clearanced to fit properly. That injector might have run fuel with water in it (US 603s don't have a water separator) or insufficiently prepared WVO.



Again, screws on the front plate aren't a guaranty of a redesigned bearing. The pump was updated a couple of ways - first, the crimed cover was attached with screws so it doesn't leak oil as the seal hardens; second, the bearing was redesigned. FWIW, I have a couple of three spare latest style vacuum pumps.

You have to match the wastegate lever arm to the stroke of the actuator so though more arm means more control, it won't amount to much if it won't open or close all the way. IIRC I had a shop move the 55 trim pin closer to the pivot so it would work with the stroke of the 50 trim actuator. But you might find a third party actuator...

I don't know if the turbine sections are the same. Does the 50 trim turbine section attach to the non-trap manifold?

Sixto
MB-less