{"product_id":"feuling-lifters-race-series-4050-4017-811-04050","title":"Feuling Lifters - Race Series (4050 \/ 4017) — Harley-Davidson Softail Heritage Classic, Road King, Softail Fat Boy (1999-2025)","description":"\u003cp\u003eFeuling Race Series hydraulic lifters engineered for high-lift cams and aggressive valve spring pressures on street and strip V-twin engines. Steel-bodied construction with a slower bleed-down rate maintains oil delivery to the top end and reduces valve float at elevated RPM.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel body construction\u003c\/li\u003e\n  \u003cli\u003eSlower bleed-down rate for high-lift cams\u003c\/li\u003e\n  \u003cli\u003eSupports valve spring pressures above 185 lbs. seat pressure\u003c\/li\u003e\n  \u003cli\u003eIncreases RPM capability and valve-train stability\u003c\/li\u003e\n  \u003cli\u003eCompatible with Feuling HP+ or Race Series oil pumps\u003c\/li\u003e\n  \u003cli\u003eSpin-Tron dyno-developed and track-proven\u003c\/li\u003e\n  \u003cli\u003eMade in the U.S.A.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Feuling\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 4017\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 6.2 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 3.45 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.3 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits V-twin motorcycles. Recommended for engines running valve spring seat pressures higher than 185 lbs.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat valve spring pressure do these lifters support?\u003c\/h3\u003e\n\u003cp\u003eRace Series lifters are recommended for engines running higher than 185 lbs. valve spring seat pressure. Lower pressures will work but may not deliver the performance benefit.\u003c\/p\u003e\n\u003ch3\u003eDo I need a high-volume oil pump with these lifters?\u003c\/h3\u003e\n\u003cp\u003eFeuling recommends a high-volume oil pump to achieve quieter operation and optimal performance. Race Series lifters are compatible with both Feuling HP+ and Race Series oil pumps.\u003c\/p\u003e\n\u003ch3\u003eCan I use these on a street engine?\u003c\/h3\u003e\n\u003cp\u003eYes — these lifters are designed and track-proven for both street and strip engines with aggressive cam profiles.\u003c\/p\u003e\n\u003ch3\u003eWhat's the difference between Race Series and standard lifters?\u003c\/h3\u003e\n\u003cp\u003eRace Series lifters have a slower bleed-down rate and support higher valve spring pressures, making them better for large-lift cams and elevated RPM applications.\u003c\/p\u003e","brand":"Feuling","offers":[{"title":"Default Title","offer_id":53035379163247,"sku":"811-04050","price":307.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_79a59387-b2c2-402b-a0c0-0e8da5a7d8a4.png?v=1779561996","url":"https:\/\/vtwinbikers.com\/products\/feuling-lifters-race-series-4050-4017-811-04050","provider":"Vtwinbikers","version":"1.0","type":"link"}