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Description: The Holley carburettor is an icon in the performance industry. Thirty, forty, even fifty years ago, if you looked under the hood of any modified or performance car, you more than likely would discover a Holley carburettor lurking there. Often, many enthusiast's first modification on acquiring a car destined for performance was to swap out the factory induction system for a new Holley 4-barrel carb and intake manifold. While many of today's modern cars have moved past carburettors and into high-tech fuel-injection systems, most cars from the highly collectible eras are still running carburettors. Carbs are comparatively inexpensive, highly tunable, and do not require laptops, expensive tuning equipment, or computers to function. And by far the most popular carb still in use is the Holley carb. In David Vizard's How to Super Tune and Modify Holley Carburetors, best selling author Vizard explains the science, the function, and most importantly, the tuning expertise required to get your Holley carburetor to perform its best for your performance application, whether it's street, strip, supercharging, or race applications. Holley has been a best-selling subject for years, and this much-needed update will guide you through the traditional 4150 Double Pumper, Dominator, and 4160 vacuum secondary models, as well as all the recent releases from Holley, including the Ultra Street Avenger and Ultra HP Series Carbs. With its high degree of tuning ease, and with all the new models coming into the market, the knowledge of an expert like Vizard is a requirement to meet your performance goals, now more than ever. Covering subjects like mixture ration, fuel atomization, applying the 'Venturi effect', air correction function, Max power variations, BSFC, Plug Reading, Track practise, Wet Source, Ignition timing, Operating conditions, accelerator pump circuit calibration, and much more, this is the essential book on the subject.