Reply to "Heat causing caliper rub?"

I think your assessment is bang-on. I also think you will need a much more effective heat shield than the thin stuff you have, especially since the heat can soak around the small pads you have on the bottom of the masters.

The header wrap should help a lot but you might not like the bandaged look. Coating inside and out will obviously help too, but I suspect you will need a cocktail of solutions given the proximity to your brake lines/masters to your high-heat headers. Have you considered an aluminum heat-deflector plate under the masters and mounted to the firewall? I'd do the same between the lines and the headers (sort or a small double firewall).

I had my GT40 headers wrapped and it does speed rust.

Have you ever noticed any changes in your clutch take-up? One would expect it to be similarly affected.

Mark