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Since Dane-ger said he had carbs, not fuel injection, it reminded me of what another member of my car pool once did (this will give away how old I am!).
He had a 1956 Ford with the 312 T-bird engine. On a couple of downhill stretches on our commute he could flip a switch to a valve that let outside air into the intake manifold, and that killed the flow of air through the carburetor. Supposedly this saved gas, but I wonder what kind of damage this might have done to the engine, plus the engine cooled too much on long downgrades.
He had an automatic transmission--no lockup in those days-- but the engine kept turning. Maybe the early Ford automatics had a rear pump like the early Mopars did that allowed this to happen.
Ray Mac.
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