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.