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EFI eliminates vapor lock by pressuring the fuel at the fuel tank. You can also eliminate vapor lock in a carbureted engine with an electric fuel pump by either replacing it completely or using the electric pump to prime the mechanical pump. See Vapor Lock. The following video shows how vapor...

I think that the mechanical fuel pump adds a lot of heat to the fuel. I think you're better off switching to an electric pump and insulating the fuel lines around the engine. See Vapor Lock.

See the article I referenced: Vapor Lock

Are you sure that gasoline isn't also percolating in the fuel pump? See Vapor Lock.

The exhaust cross-over passage often gets carboned-up and the most practical way to clean it is to hot tank it. There is no way for oil under the intake manifold to get into the cross-over passage. The plate just keeps the oil in the lifter valley from splashing up onto the hot cross-over...