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Return to Parts List Category : O- Carburetors (Vac Sec) QFT 600-1 NITROUS SWITCH - 4150 $46.52 W.O.T. Nitrous switch. Fits QFT®, PROFORM®, and Holley® 4150 style carburetors. Requires adjustable secondary pump cam bracket to engage switch (QFT P/N 63-2). Powder-coated red for durability and great looks. Comes with detailed instructions and mounting hardware.