{"product_id":"henkyo-accelerator-pump-discharge-nozzle-kit-for-holley-4150-4160-4500-4-piece-031-033-035-037-cnc-brass","title":"HENKYO Accelerator Pump Discharge Nozzle Kit for Holley 4150\/4160\/4500 — 4‑Piece .031\/.033\/.035\/.037 CNC Brass","description":"\u003cp\u003e\u003cstrong\u003eHENKYO’s four-piece accelerator pump discharge nozzle kit supplies precision brass jets in .031, .033, .035 and .037-inch sizes for Ho-*lley 4150\/4160\/4500-style carburetors.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis kit contains four different-diameter brass accelerator pump nozzles designed as direct replacements for Ho-*lley part numbers 121-131, 121-133, 121-135 and 121-137. Each nozzle is CNC-machined for accurate orifice size and includes a copper gasket for a secure, leak-free seal. The variety of sizes gives tuners and restorers options to fine-tune throttle response without changing pump cams or diaphragms.\u003c\/p\u003e\n\n\u003ch3\u003eWhich nozzle sizes are included and why multiple diameters matter?\u003c\/h3\u003e\n\u003cp\u003eThe set contains one nozzle of each diameter: 0.031\", 0.033\", 0.035\" and 0.037\". Different orifice sizes change the volume of fuel delivered by the accelerator pump during sudden throttle openings, allowing you to tune transient response to engine needs and conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e0.031\" — leaner shot for smoother transitions\u003c\/li\u003e\n  \u003cli\u003e0.033\" — moderate flow for balanced response\u003c\/li\u003e\n  \u003cli\u003e0.035\" — increased fuel for quicker throttle recovery\u003c\/li\u003e\n  \u003cli\u003e0.037\" — richer pulse for aggressive throttle demands\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install these HENKYO accelerator pump nozzles?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: remove the old nozzle from the pump discharge housing, fit the new brass nozzle into place, and compress the supplied copper gasket to form a tight seal. No special tools are required beyond common hand tools, but work carefully to avoid over-tightening the gasket.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean pump housing before inserting new nozzle\u003c\/li\u003e\n  \u003cli\u003eSeat nozzle fully so the orifice aligns with discharge tube\u003c\/li\u003e\n  \u003cli\u003eCompress copper gasket gently to avoid deformation\u003c\/li\u003e\n  \u003cli\u003eTest throttle response after reassembly and warm-up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these nozzles fit my carburetor model and vintage rebuilds?\u003c\/h3\u003e\n\u003cp\u003eThese nozzles are made for 4150\/4160\/4500-series Ho-*lley-style carburetors and match common vintage replacement part numbers 121-131\/121-133\/121-135\/121-137. They’re suitable for restorations, performance tuning and maintenance where original-style straight jets are required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with 2300\/4150\/4160\/4500 Ho-*lley-style carbs\u003c\/li\u003e\n  \u003cli\u003eDirect-fit for many classic and performance applications\u003c\/li\u003e\n  \u003cli\u003eUseful when OEM jets are worn, clogged or missing\u003c\/li\u003e\n  \u003cli\u003eBrass construction resists corrosion in fuel environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat material and manufacturing quality can I expect?\u003c\/h3\u003e\n\u003cp\u003eEach jet is CNC-turned from brass for dimensional accuracy and corrosion resistance. The kit includes a copper gasket for a reliable, long-lasting seal; the nozzle design mirrors vintage improved accelerator pumps but with modern machining tolerances.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-precision CNC machining for consistent flow rates\u003c\/li\u003e\n  \u003cli\u003eBrass body resists fuel-induced corrosion\u003c\/li\u003e\n  \u003cli\u003eCopper gasket included for dependable sealing\u003c\/li\u003e\n  \u003cli\u003eRobust enough for repeated install\/removal during tuning\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This HENKYO nozzle kit is aimed at classic car restorers, hot rodders, and tuners who need a simple, affordable way to adjust accelerator pump shots on Ho-*lley 4150\/4160\/4500-style carburetors. It’s also useful for mechanics servicing vintage fleets or anyone replacing worn or clogged pump jets to restore crisp throttle response.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these nozzles compatible with my Ho-*lley 4150 carburetor?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit is designed for 2300\/4150\/4160\/4500-style Ho-*lley carburetors and matches common 121-131\/121-133\/121-135\/121-137 part numbers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I change nozzle size without other carb modifications?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Swapping nozzle sizes alters pump shot volume directly, often improving throttle response without changing cams or diaphragms.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"HENKYO","offers":[{"title":"Default Title","offer_id":67587555295417,"sku":"B0DPQFZH4L","price":102.53,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/henkyo-nozzle-front-packaging.jpg?v=1790512562","url":"https:\/\/redleafauto.ca\/products\/henkyo-accelerator-pump-discharge-nozzle-kit-for-holley-4150-4160-4500-4-piece-031-033-035-037-cnc-brass","provider":"Redleaf Auto","version":"1.0","type":"link"}