{"product_id":"gyutong-20-12-accelerator-pump-cam-kit-for-holley-2300-4150-4160-8-profile-adjustable-throttle-response","title":"GYUTONG 20-12 Accelerator Pump Cam Kit for Holley 2300\/4150\/4160 — 8-Profile Adjustable Throttle Response","description":"\u003cp\u003e\u003cstrong\u003eGYUTONG's 20-12 accelerator pump cam kit is an 8-profile set that lets you precisely control pump shot volume and timing on Holley 2300, 4150, and 4160 carburetors for improved throttle response.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen a carbureted engine hesitates or stumbles off the throttle, the accelerator pump cam often determines how much fuel is delivered and when. This 20-12 kit from GYUTONG supplies eight distinct cam shapes so you can match pump action to your engine displacement, camshaft, intake, and driving style without guessing. The kit is compact, straightforward to swap, and intended for tuners who want repeatable, measurable changes to throttle behavior.\u003c\/p\u003e\n\n\u003ch3\u003eHow does each cam profile change throttle response?\u003c\/h3\u003e\n\u003cp\u003eEach cam contour alters both the initial fuel shot and the subsequent ramp duration. Steeper ramps give a quick, concentrated shot that ends sooner, while gentler ramps prolong fuel delivery for smoother throttle transitions. Choosing the right profile reduces bogging, flat spots, or surging.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSteep profiles: rapid, concentrated pump shot to eliminate hard stumble.\u003c\/li\u003e\n  \u003cli\u003eModerate profiles: balanced mid-range response for daily driving.\u003c\/li\u003e\n  \u003cli\u003eGradual profiles: extended fuel delivery for smooth acceleration.\u003c\/li\u003e\n  \u003cli\u003eFine increments: small steps between cams for precise tuning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich Holley carburetors and applications is this kit compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis kit is engineered for common Holley models—2300, 4150, and 4160—covering a wide range of street and performance setups. It suits muscle cars, restored classics, and modified engines where throttle response needs refinement after changes to induction or cam timing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect fit for Holley 2300, 4150, 4160 pump cam bores.\u003c\/li\u003e\n  \u003cli\u003eUseful for street, performance, and light racing applications.\u003c\/li\u003e\n  \u003cli\u003eGreat for carburetor upgrades after intake or cam swaps.\u003c\/li\u003e\n  \u003cli\u003eWorks well in DIY tuning and professional engine shops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat measurable changes should I expect after installing a different cam?\u003c\/h3\u003e\n\u003cp\u003eSwapping cams changes fuel shot volume and timing, so you’ll notice variations in throttle response, off-idle behavior, and transition smoothness. Adjustments may require small carburetor jetting or dwell adjustments to fully optimize air\/fuel mixture across the throttle range.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLess off-idle hesitation with quicker cam ramps.\u003c\/li\u003e\n  \u003cli\u003eSmoother gradual acceleration with extended-duration cams.\u003c\/li\u003e\n  \u003cli\u003eRepeatable tuning steps for methodical testing and logging.\u003c\/li\u003e\n  \u003cli\u003eCan reduce need for broader jetting changes when fine-tuning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to install and swap cams during tuning sessions?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone familiar with basic carburetor service. The cams are designed to be swapped without special tools beyond common hand tools and follow-up throttle testing. Keep the rebuild manual or spec sheet handy for exact pump arm settings and orientation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple removal of accelerator pump lever and old cam.\u003c\/li\u003e\n  \u003cli\u003eSlide in chosen cam and verify pump action travel.\u003c\/li\u003e\n  \u003cli\u003eTest throttle response on a safe, controlled run after each change.\u003c\/li\u003e\n  \u003cli\u003eNo machining or special adapters required for supported Holley models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The GYUTONG 20-12 accelerator pump cam kit is aimed at DIY mechanics, classic car restorers, performance enthusiasts, and professional tuners who need precise, repeatable control over accelerator pump characteristics. If you want to eliminate off-idle stumble, tailor throttle feel to your driving preferences, or methodically tune a carburetor after modifications, this kit offers practical, low-cost cam profile options in one compact set.\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: Will this kit fit my Holley 4150 carburetor?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The GYUTONG 20-12 cam kit is designed to fit Holley 2300, 4150, and 4160 accelerator pump cam bores.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need special tools to swap cams?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special tools are required—basic hand tools and access to the pump lever suffice for swapping cams.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GYUTONG","offers":[{"title":"Default Title","offer_id":48085962817694,"sku":"B0GWH62TXP","price":43.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gyutong-accelerator-pump-cams-front.jpg?v=1785881486","url":"https:\/\/northtrailauto.ca\/products\/gyutong-20-12-accelerator-pump-cam-kit-for-holley-2300-4150-4160-8-profile-adjustable-throttle-response","provider":"North Trail Auto","version":"1.0","type":"link"}