My old Pontiac has a steel tube behind the driver's side head (between firewall and head) that (2) 12ga wires go through to the starter. The tube is intended to protect the wires from exhaust pipe and nanifold heat, but I've been reading horror stories of the tube cooking the wires. I've been looking at special high heat silicone/fiberglass wire sleeve good to about 550° F, but I looked on the shelf and I have some titanium exhaust wrap. Any problem using that to wrap the wires then run through the tube?
go find a junker piece of commercial food service equipment, say, an electric convection oven, they are full of high temp insulated wiring
I use black header and exhaust wrap in any place where wiring or brake lines might get heated from headers. I hate the stuff on header tubes as it just causes rust. But to protect wiring and brake lines it does a great job, and tied with proper SS wrap ties it looks good and does the job. The black is much nicer than white or brown I've seen.
another 20 dollar cure for a 10 cent problem. If I was worried about the metal tube (yes I have seen cooked wires) I would just move the wires. The tube was not a heat shield by the way it was a wire loom to route wires away from the heat and worked well until someone left the bolt out that holds it in place or the little bracket broke off.
If the tube will accommodate it, pull the wires and wrap them individually with some high heat fiberglass tape and re-assemble them back into the tube.
Cut a piece of heater or vacuum hose lengthwise & run the wires through it instead of the steel tube. The rubber is a great insulator & it prevents chafing too.
Go on Summit or Jegs and look for Heat Sleeves or Fire Wrap. https://www.summitracing.com/search/part-type/heat-sleeves
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