In the process of stripping a spare 5.3 engine down with lucas ignition.

I pulled the distributor and noticed that the vacuum module appeared to be adjustable, was this an original feature or is this a replacement module.

 

Wayne,

I have never seen an adjustable unit as a Jaguar offering, but there have been many,many aftermarket operations offering all sorts of "direct fit" for Lucas stuff over the years.

A snapshot if possible may assist with identifying it.