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The 20-121 should be used in conjunction with transmission kickdown / throttle cable brackets such as Holley PN 20-95 (steel) or the Holley PN 20-112 and 20-119 (aluminum) brackets
2017-2019 Ford F-350 Super Duty XL Crew Cab Pickup
BBK Performance throttle bodies are designed as a direct replacement for the restrictive stock factory throttle body
Holley Needle & Seat - "Steel" Needle and Seat (Adjustable w/ .110" Seat) Brake Line Tubing Clip It's that easySteel tipped inlet needles are necessary when using exotic racing fuels or alcohol or when using benzine or acetone additives. a . 097" seat size should be used for small four barrel carburetors; a . 110" seat size should be used for carburetors up to 735 CFM; larger seat sizes should be used with carburetors 750 CFM and larger. "Adjustable" needle and seat designs allow external float adjustment, without removing the fuel bowl. The "non adjustable"