now this is interesting,
I remember fabricating for my neighbor's '62 Ford a metal can with
braided shielded wires to cover his distributor and cables out to the
plugs. I no longer knew when he drove out of his driveway by watching
the patterns on my TV (UHF).

Now for the question.
Any one know if these boots, if self-fabricated, are essentially a
CYLINDER, grounded by contact with the engine block?

On Oct 29, 6:06 pm, wrote:
.. A
significant amount of igniton noise comes from the connection between
the plug and the plug wire, and grounded metal shields over the boots
can help here. There are wire kits with these boots, mostly for German
cars, or they can be made with metal tubing slipped snugly over the
metal bases of the plugs.