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Originally Posted by rspears

Welcome to CHR! I agree with Tech, it sounds like you're boiling the fuel out of the bowls. I like that heat shield that he linked to, as it shields from radiant heat from the intake as well as the heat conducted through the base, but if you simply cannot abide that "look" covering so much area you might consider a thick spacer as a starting point, and see if that does it. They come in a bunch of materials, from wood fiber composites to phenolic, but you don't want the aluminum model. Summit has a ton of them, based on the bore of the carb - http://www.summitracing.com/search/p...9%2B4294949621

I have used a some of these and can tell you that a few minutes on a rouge wheel will polish the aluminum ones up very nicely.

I agree with Tech and rspears. sounds like a form of vapor lock. It can also be caused by fuel lines getting hot;

A vapor lock is more likely to develop when the vehicle is in traffic because the under-hood temperature tends to rise. A vapor lock can also develop when the engine is stopped while hot and the vehicle is parked for a short period. The fuel in the line near the engine does not move and can thus heat up sufficiently to form a vapor lock. The problem is more likely in hot weather or high altitude in either case.