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I have had some dealings of working on a Range Rover. Their post like Michigan made...MagnaCore wires. They have the same spiral wound core but the model Range Rover I worked on did not include the fiberglass. Don't know what else they offer but they do provide a good hot spark. They make it run smoother than the stock Rover wires did.

Your wires have a nice touch if that is where the heat gets them.

I could just over a thousand miles on parts house regular wires for a motor home mounted 454 Chevy.

I purchased some High Energy Jacob's plug wires from Camping World RV with a lifetime warranty. Because they came with Ceramic plug terminals @ $125.00. They lasted a couple thousand miles. I had to contact Mr. Gasket Co. to get warranty replacement because they bought out Jacobs. They would only warrant one set! They also suggested their fiberglass covers on top of the ceramic ends. I wasn't happy about the end of my lifetime warranty so I bought some from another maker. $58.00 for eight.

Then I doubled up: Heat shields!
I then took cardboard (cereal box) and shaped it to fit 1/2 to 3/4th's way around the wires. For a pattern to be transferred to some 22 gauge metal. Welded a rod to hold them together. I fasten my setup to the manifold bolts.

Between that and the fiberglass covers they have been working for over two years now. Don't have to have factory parts to do a job.

I 'm not aware if there are heat shields offered aftermarket for engines. Sometimes you have to build your own or shop around a lot I bet!


Phil