{"product_id":"mcs524459","title":"Kibblewhite KPMI, Valve Spring Kit. .415\" Lift. Steel Top Collars – 1936–1947 Knucklehead","description":"\u003ch2\u003eKibblewhite KPMI, Valve Spring Kit. .415\" Lift. Steel Top Collars – 1936–1947 Knucklehead\u003c\/h2\u003e\n\u003cp\u003eReduces total valve train mass. Great for OEM rebuilds with stock specifications from stock .348\" lift to a maximum of .415\" valve lift. The springs are manufactured from the highest quality clean chrome silicone wire; shot peened and heat treated for maximum fatigue life. Kit includes springs; upper collars; lower collars; and valve keys. Max valve lift: .415\". Installed height: 1.375\". Seat pressure 127 lbs. Open pressure: 270 lbs. @ .415\" valve lift. Note: Components are stock style replacement and can be used without modifications.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e36-47 Knucklehead (NU)\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Kibblewhite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; VALVE SPRINGS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e KIT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 524459\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kibblewhite","offers":[{"title":"Default Title","offer_id":57377357791619,"sku":"MCS524459","price":131.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/524459k_bdb2a6e4-8d2e-478f-b431-2f673bdabd7e.jpg?v=1775579893","url":"https:\/\/hogparts.com\/products\/mcs524459","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}