ATF can run pretty darn hot, then placed next to the headers and the temperature the rubber can see may be much higher than you think.
I went through this using AN-10 hoses from the oil filter adapter to a remote filter. Even with a protective aluminized wrap, the hoses would eventually start seeping. When I'd remove the hose fitting, I could hear the inside cracking as the hose was bent. :eek: On that engine, oil temperatures would sometimes exceed 290 F, but having the exhaust right there made it that more worse. IF you can find an AN hose with continuous use temperature rating above the expected fluid temperatures, then you'll still need to insulate from the header heat. Aeroquip firesleeve plus a fiberglass reflective sleeve over it would be good combo, although no guarentees.
I think you're best off with a steel or st steel hardline like factory. Use the factory type supports for it. You can still slip insulation and/or reflective material over them if needed.
The teflon plastic interiors like sireland mentioned are common in -3 and -4. Agree thats a possible option. Might need a little larger inside diameter, -5 or 6 ? For the 90 degree turns, use the matching AN tube type fittings. The hose won't make tight turns and you don't want to loose flow with a sharp elbow.
