I got a hold of one of these.  The most significant difference, aside from the material, seems to be the bypass valve.  It is a ball, rather than a piston and uses a press in plug, rather than screw in.  I think that might  be a better design.  The ball seats in a taper at the end of the bore and is quite a bit smaller than the bore so it will not stick like a piston might.  It should also make it easier to dial in the desired pressure.   If you shim the oem spring too much, it can come out of the bore in the plug and cause the piston to bind.  No chance of that happening here.  I'd be more comfortable with a screw in plug so I'll see how easy it will be to modify that.

The only thing I see cast onto it is W 5779 A and 3 dots.  It looks like it might be based on the ECG pump because of the cover orientation, which is different on the C1 pump.  I'll take a closer look and compare to some Ford pumps later.







Lawrenceville, GA