Thinking out loud here. Between the intake and blower case (Roots style, from Dyers) for my new 438 there are two, 1/2" thick aluminum spacers. Essentially, to give the case enough space to clear the dizzy. Aluminum is horrible for heat transfer, not to mention these spacers are pretty massive. I've never seen it done, but why couldn't I take a 1" thick slab of the proper grade phenolic (CE minimum), cut it out to spec, and use that? Basically, it would be the same thing as a phenolic carb spacer. It would reduce heat, and save a bit of weight from the nose. I realize it will have a different thermal expansion rate from aluminum but I can't see an issue since they work so well for carb spacers. Delrin is an option, but the phenolic seems like a better route to me. Just curious what the rest of you thought of the idea.