{"product_id":"mcs524452","title":"Kibblewhite KPMI, Valve Spring Kit. .460\" Lift. Steel Top Collars – 1936–1947 Knucklehead","description":"\u003ch2\u003eKibblewhite KPMI, Valve Spring Kit. .460\" Lift. Steel Top Collars – 1936–1947 Knucklehead\u003c\/h2\u003e\n\u003cp\u003eReduces total valve train mass. Great for racing high lift performance builds. 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: .480\". Installed height: 1.310\". Seat pressure 158 lbs. Open pressure: 340 lbs. @ .480\" valve lift. Note: Kit must be used with Kibblewhite Precision engineering (KPMI) valve guides. Stock dimensions valve guides must be shortened. Valve guide machining instructions are included with this kit.\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 524452\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kibblewhite","offers":[{"title":"Default Title","offer_id":57377357595011,"sku":"MCS524452","price":148.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/524452k_0102cd15-cd88-4b57-9061-e3fbb9eccc97.jpg?v=1775579894","url":"https:\/\/hogparts.com\/products\/mcs524452","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}