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Re: Needing advice on vapor lock problem.
Vapor has happened to me when the fuel pump gets old, and the internal bypass "gets weaker" as rpm goes up. For lack of a better term. Besides proximity heat issues.
Like others have mentioned verify you fuel line is not getting unduly hot from proximity to the exhaust.
Also is the fuel line from the pump to the carb touching the motor? They often get buried, and are the easiest way for heat to vapor lock your car.
If you lived in Vegas or some other represively hot location running a higher psi mechanical or electric if you have too. Into a bypass regulator. This keeps fresh cool fuel practically at the carb. I like mine on the manifold if visuals do not matter.
My friend had a hot 454 in a rcsb C10. It would always vapor lock on 100* days. We put a bypass regulator practically on the Holley 750, and it never did it again. We even took it to Vegas, and it was 115-120*. No issues.
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