We tested this stuff years ago. Found hardwood actually worked better than phenolic spacers did. We settled on 1/2" spacers. But this was years ago for sure. Also those heat shields have been around for years, in a pump gas street car with a tight engine compartment they wore worth something I would imagine. Will definitely help with boiling fuel in the bowls for sure.

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"