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Holley 4160 jetting chart6/15/2023 ![]() Hot air is less dense than cold air - there are actually fewer air molecules in a specific volume of warm air than in the same volume of cool air. Keep in mind though, the density of air decreases when temperature increases. A few specific carburetors require stagger jetting, but for the most part, the factory installed jets will be within a couple of numbers of being right.įair enough. ![]() When it comes to calibration, Holley carburetors are base line jetted at sea level at 70 degrees F. The "as delivered" jetting from Holley is very close to optimum for the majority of high performance applications. ![]() And because of this, main jetting is often the cause of confusion in high performance carburetors. For many, carburetor jetting and horsepower seem inexplicably linked.
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