Horrible MPG/Fuel odor troubleshoot

RustyRatRod said

I don't know who "they" are, but IMO, they are wrong. I've read all about that too and known people who've done it. It just never works as well as tuning with a power valve correctly.

Also, what I was getting at is, if it has a power valve and it is ruptured, that could be the whole problem.

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Agreed on the power valve statement. Before we knew about the check valve trick or Holley doing it themselves it could get expensive going through power valves if you had a backfire. The plugging of the power valve was mainly recommended for applications where idle vacuum was so low because of a radical cam that the vacuum at WOT was enough to close the weak valve and cause a lean out. Not a good thing. Intermediate fuel mixture was always over rich but for "on-off" drag applications it was functional. It also became a crutch for lazy tuners or handy for out board carbs on mechanical six pack setups.