Hey,
I'm finally getting ready to put my rebuilt 5vz in the 4runner. I picked up a set of used thorley headers and noticed there is no easy way to attach any type of heat shielding by the exhaust manifolds or on the crossover. I have some aluminum heat shielding but was unsure how to attach it to the headers.
What have you guys done?

Regards
Matthew

 

I'd probably wrap them with fiberglass insulating tape secured at the ends with thin screw clamps.

 

I ran one of these, I believe the 6x12 across the 4 primaries on my 22r header. They are pretty adaptable and give you a standoff between the heat shield and the header. Haven't loosened up. I've heard maybe wrap isn't the best way to go, but haven't tried it myself. https://www.designengineering.com/he.../pipe-shields/

 

I was ready to wrap the headers but you have read mostly bad things about doing it.
The standoffs are what I need!

 

Here are some photos of my setup...the heat shields themselves are pretty spendy, but there are probably lots of ways to just use the standoffs with a cheaper heat shield. I was trying to solve the problem I created of putting my air intake directly over the header. The heat shield on the header definitely helped.

 

Most of the purpose and benefit of insulating header pipes is in the keeping of the exhaust heat inside the header pipes to promote maximum scavenging of exhaust gasses from the cylinders.
Heat shielding at a distance from the pipes might keep the engine bay slightly cooler, but it does not really accomplish much.from an increased performance standpoint.

Cheap headers do rust if wrapped insulation holds moisture against them, but you get what you pay for.

 

I don't think wrapping headers on a supercharged 5vz is going to give me any performance gains. Not worried about rust in the stainless thorleys but more worried about "super-heating" them and causing cracks or burn through.
My goal with heat shields is to protect under hood hiring and try to keep some heat off of the firewall just like the factory manifolds/crossover.