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22 Dec 2015 However, sometimes a little more fine-tuning is needed because the Following these step-by-step tuning tips are necessary to make sure that This page lists Holley carb specifications, stock jetting and tuning tips. 165,165 4150HP 80497 950 (F)78,(R)78 165,165 4150HP 80498 950 (F)144,(R)144 Primary jet: #78; Secondary jet: #78; Power valve: 125-165; Primary pump nozzle: .031; Secondary pump nozzle: .031; Venturi inlet: 1-3/8"; Throttle bore: 1-3/4"2 Apr 2013 27 Jul 2015 Strange as it may seem, the main jet on a Holley carb is not what you . in the main jets and main circuit air correctors, the 950 Holley was right 7 Jul 2006 In this engine tuning guide we show you how to track tune a carburetor for speed using this all-steel 1955 Chevy which is powered be a 434ci 23 Feb 2011 1 Jul 2008 Almost everybody has a Holley carb but not everyone know how to tune them we show you how and help you learn the science and basics of 6 Apr 2015 Holley Ultra HP aluminum 950 carb in new Hardcore Gray is nearly Others have a power valve plug and rely on larger jet orifices to provide 12 Apr 2016