NHRA Accepted Products Table of Contents - NHRA.com

NHRA Accepted ProductsIII. FOR CLASSES LIMITED TO 850 CFM CARBURETORS:Applicable Classes: SS/AS, SS/TA, A/EA, C/SM, C/SMAPart Primary Primary Secondary SecondaryManufacturer Number Throttle Bore Venturi Throttle Bore Venturi Applicable NotesHolley 2953 1.750" 1.589" * 1.750" 1.589" *Holley 2973 1.750" 1.589" * 1.750" 1.589" *Holley 3418 1.750" 1.589" * 1.750" 1.589" *Holley 4054 1.750" 1.589" * 1.750" 1.589" *Holley 4223 1.750" 1.589" * 1.750" 1.589" *Holley 4296 1.750" 1.589" * 1.750" 1.589" *Holley 4455 1.750" 1.589" * 1.750" 1.589" *Holley 4493 1.750" 1.589" * 1.750" 1.589" *Holley 4559 1.750" 1.589" * 1.750" 1.589" *Holley 4578 1.750" 1.589" * 1.750" 1.589" *Holley 4781 1.750" 1.589" * 1.750" 1.589" *Holley 8162 1.750" 1.589" * 1.750" 1.589" *Holley 9380 1.750" 1.589" * 1.750" 1.589" *Holley 9646 1.750" 1.589" * 1.750" 1.589" *Holley 80781 1.750" 1.589" * 1.750" 1.589" *Holley 8471 1.750" 1.589" * 1.750" 1.589" *Barry Grant 1563010DR 1.750" 1.589" * 1.750" 1.589" *Quick Fuel SSR-8562 1.750" 1.589" * 1.750" 1.589" *1. * = All venturi dimensions include the .025"maximum allowance.2. Minimum Throttle shaft diameter at thinnest pointis .085". Minimum throttle plate thickness atthinnest point is .040".3. For all carburetors used in these classesmodifications are limited to removing the chokeplate, shaft, and operating mechanism; replacingboosters, jets, needles and seats, acceleratorpumps, and squirters; replacing or blocking powervalvres, replacing or modifying float assemblies andbaffles; resizing existing fuel and air bleedpassages; drilling idle holes in the primary throttleplates; and polishing any surfaces. The originalbodies, base plates, float bowls, and meteringblocks are required.Page 116 1/14/2014