If it's not really about tuning or wiring. Then it belongs in here.
Has anyone used used phenolic spacers between the head and intake manifold. Im using a billet/sheet metal manifold and it gets dam hot. Trying to look at ways to reduce temp.
Have added extra bonnet vents which has helped.
Seems like a great idea. If you can't find something for your application, here are some clues to using PTFE (Teflon) sheets:
links are bad, but here is another source to give you an idea of prices for PTFE that could be cut / machined:
Sourcing the materials is easy its just if the cost is worth the result.
There will be a benefit, but how much is impossible to say as there are many factors involved, with only one being the heat from the cylinder head - heck, if it's bad enough, the head may even be drawing heat from the manifold.
There are three ways heat is transferred - direct physical contact, radiation or convection
There are other things that may also help - using thermal paint on the manifold assembly, some have reported good results with chroming but that may be expensive, perhaps some form of heat shields can be formed with, maybe, a forced air flow arranged through it?
I went from a cant touch from heat intake manifold to a cool manifold, then after adding a small wmi nozzle post intercooler to a manifold that sweats in the texas heat even after a 9000rpm 30+psi blast around COTA. I have a 15mm thick spacer between manifold and cylinder head. Worth the $75 bucks to me.