Jetting a carburetor is one of the few "black arts" in the automotive world that is still a mystery to most racers and tuners. Most tuners still look at the spark plug, the exhaust port, and the first ...
Some stories are so obvious and necessary that it's difficult to identify the need. Surely everybody knows what a Q-jet looks like and how to tell it apart from an old Carter or a Holley 4150. "Not so ...
Holley has always offered vacuum-secondary performance carburetors in two versions--4150 models with replaceable jets in the secondaries, and 4160 models with a metering plate and no replaceable jets.
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