[lippy]

Phenolic. I think you can buy it from McMaster-Carr in several thicknesses and sizes. It can be cut and machined.

Similarly, when I got my car on the road earlier this year, one of the first problems I had to contend with was fuel percolation due to a combination of crappy CA fuel and heat soak in a hot engine bay. Once I stopped the car hot, I had a heck of a time restarting because the fuel would boil in the bowls once fuel and air flow stopped. The solution was straightforward and effective: I first added a phenolic spacer (Jomar 5025 from Jegs) between the carb and intake manifold, and that pretty much solved the problem. Since hood clearance is an issue for me and many others, I found just one 0.25" spacer (most of the others were thicker). That was all I needed. After that, just for some extra margin, I insulated the fuel lines going from the regulator to the carb (AN -6), and also a couple feet of the fuel line that feeds the regulator (AN -8) and passes near the headers.