Warning: TTI Exhaust with A/T, Console, Manifolds ('65 Abody).

dibbons said
The specs for all of these high temp silicones are confusing to me. This describes what product I purchased:

500°F / 260°C continuous rating, 800°F / 426°C for periods up to 30 minutes 2200°F / 1205°C for periods up to 15 minutes and short excursions to 3000°F / 1650°C.

AS1072 Aerospace grade firesleeve is fabricated from a dense E-type braided sleeve and then receives a thick coating of self-extinguishing silicone rubber that withstands flame exposure, allowing qualified hose assemblies to meet FAA TSO-C42 (Propeller feathering hose assemblies), TSO-C53a (Fuel and Oil system hose assemblies) and TSO-C75 (Hydraulic hose assemblies). Standard lengths are 100 feet; specific cut lengths are available. Standard color is Oxide-Red in all sizes and Black is available in sizes -04 through -32. Nominal wall thickness is 0.16”.

If I remember correctly I had a good 1 inch space between the pure silicone tubing (heavy wall braided) and the exhaust. I was really surprised when it caught on fire and even more surprised that it's extremely hard to extinguish. Once it catches on fire it bubbles and melts and drips and sticks to everything. I will never again use it near any high heat source on my cars. Maybe a fiberglass sleeve or a sheet metal heat sink/shield (which is what I ended up with)???