{"title":"Cylinder Heads \u0026 Parts - Evo","description":"\u003cp\u003eShop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.\u003c\/p\u003e\n\u003c!----\u003e","products":[{"product_id":"ss90-2001","title":"Exhaust Valve. Fits 89cc or 91cc S\u0026S Heads. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* Replacement intake valve for S\u0026amp;S Super Stock Heads.\u003c\/p\u003e\n\u003cp\u003e* Fits Big Twin 1984up, Sportster 1986-2003 \u0026amp; S\u0026amp;S X-Wedge. \u003c\/p\u003e\n\u003cp\u003e* 1.605″ x 4.428″ @ 1.509″ Gauge.\u003c\/p\u003e\n\u003cp\u003e* Sold Each.\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":49879792222500,"sku":"SS90-2001","price":214.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS90-2001.jpg?v=1733914676"},{"product_id":"ss50-0333","title":"Head Bolt Covers. Fits S\u0026S Head Bolts. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* Fits Big Twins 1984up \u0026amp; Sportster 1986–2003.\u003c\/p\u003e\n\u003cp\u003e* Magnetic Covers.\u003c\/p\u003e\n\u003cp\u003e* Fits S\u0026amp;S Head Bolts Only.\u003c\/p\u003e\n\u003cp\u003e* Sold as a Pack (4).\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":49879860412708,"sku":"SS50-0333","price":238.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS50-0333.jpg?v=1733917202"},{"product_id":"cm-2011-8","title":"Head Bolts with Polished 12 Point - Chrome. Fits Evo Big Twin 1985-1991, Sportster 1986-1992 \u0026 S\u0026S Heads. - Colony Machine","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* Custom Look.\u003c\/p\u003e\n\u003cp\u003e* Polished \u0026amp; Chrome Plated, 12 Point Dome Top Headbolts.\u003c\/p\u003e\n\u003cp\u003e* Replaces OEM 16480-85A \u0026amp; OEM 16478-85A\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by Colony Machine !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"COLONY MACHINE","offers":[{"title":"Default Title","offer_id":49880587436324,"sku":"CM-2011-8","price":317.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/CM-2011-8.jpg?v=1733919597"},{"product_id":"fe-1120","title":"585in. Lift ECONO Performance Beehive Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. - Feuling","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFEULING ECONO performance BEEHIVE valve springs designed to handle up to 585 lift camshafts at an economical price. These FEULING BEEHIVE springs are made from the same premium stress relieved conical ovate wire as our HIGH LOAD springs but are developed for economical engine budgets. They have an excellent level of fatigue life and are designed to handle the demands of performance engines with 585 and smaller lift camshafts. Dyno proven and track tested.\u003c\/p\u003e\n\n\u003cp\u003eFEULING BEEHIVE valve sprin\u003c\/p\u003e\n\u003cp\u003egs use a much smaller and lighter weight retainer which drastically reduces the valve weight creating a much quicker revving and smoother motion than comparable dual valve springs.\u003c\/p\u003e\n\n\u003cp\u003eKits include: FEULING ECONO BEEHIVE valve springs, lightweight steel retainers, machined heat treated chrome moly spring seats, seat shims, valve locks and a set of premium Viton valve seals equipped with a spring loaded valve stem wiper system.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"FEULING","offers":[{"title":"Default Title","offer_id":49880615485732,"sku":"FE-1120","price":364.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/FE-1120.jpg?v=1774330007"},{"product_id":"ss90-4914","title":"Electric Compression Release Assembly. Replacement for Kit # SS90-4915. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* Includes white silicone cap.\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":49880740135204,"sku":"SS90-4914","price":475.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS90-4914.jpg?v=1733926208"},{"product_id":"ss90-4915","title":"Electric Compression Release Kit. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* Fits Twin Cam with S\u0026amp;S Heads.\u003c\/p\u003e\n\u003cp\u003e* Fits Evo 4″ \u0026amp; 4-1\/8″ Bore Engines with S\u0026amp;S Heads.\u003c\/p\u003e\n\u003cp\u003e* Must be used in conjunction with S\u0026amp;S Rocker Covers.\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":49878520791332,"sku":"SS90-4915","price":1068.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS90-4915.jpg?v=1733938383"},{"product_id":"ss90-1004","title":"Super Stock Cylinder Head Kit - Silver. Fits Big Twin 1986-1999, Requires S\u0026S Pistons - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eThese S\u0026amp;S® Super Stock® cylinder heads for 1984-’99 HD® Evolution® Big Twin engines feature a specially shaped combustion chamber and require special pistons that must be purchased separately. (Not compatible with stock style flat topped pistons) Large 2.000″ intake and 1.605″ exhaust valves and high flowing ports supply plenty of air for big inch engines. Compatible with cams with lifts up to .650″. Compatible with stock 3-1\/2″ or 3-5\/8″ bore engines. Order appropriate gasket kits separately fo \u003c\/p\u003e\n\u003cp\u003er your specific bore size. Natural aluminum finish.\u003c\/p\u003e\n\u003cp\u003eFitment Notes:\u003c\/p\u003e\n\u003cp\u003e———————-\u003c\/p\u003e\n\u003cp\u003e1. Works with 3.5″ and 3-5\/8″ Cylinders\u003c\/p\u003e\n\u003cp\u003e2. Requires SS92-1062 Pistons\u003c\/p\u003e\n\u003cp\u003e3. Requires SS16-1628 manifold when using an E series carb \u0026amp; stock height cyls.\u003c\/p\u003e\n\u003cp\u003e4. Requires SS16-1736 manifold when using CV or Mikuni carb \u0026amp; stock height cyls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":51071299846436,"sku":"SS90-1004","price":4464.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS90-1004.jpg?v=1758380025"},{"product_id":"ss106-6059","title":"76cc Cylinder Head Kit - Silver. Fits Big Twin 1986-1999. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* 585″ Lift.\u003c\/p\u003e\n\u003cp\u003e* Heads works with 3.5″ \u0026amp; 3-5\/8″ cylinders.\u003c\/p\u003e\n\u003cp\u003e* Intake ports are the same size as OEM so the H-D manifold bolts on\u003c\/p\u003e\n\u003cp\u003e* Works with OEM style flat top pistons.\u003c\/p\u003e\n\u003cp\u003e* Front head is machined to accept OEM cyl head temp sensor on EFI models 1995-1998.\u003c\/p\u003e\n\u003cp\u003e* Slight increase in compression CR = 8.8:1 using OEM pistons \u0026amp; 80ci barrels.\u003c\/p\u003e\n\u003cp\u003e* Compatible with any stock or aftermarket, standard or roller tipped rocker arms.\u003c\/p\u003e\n\u003cp\u003ePeople who Buy th\u003c\/p\u003e\n\u003cp\u003eis Product also Purchase:-\u003c\/p\u003e\n\u003cp\u003e* 3.5″ OEM replacement Black Cylinders # SS910-0179\u003c\/p\u003e\n\u003cp\u003e* Top End Gasket Kit #’s JGI-17033-83-MLS 1984-1991 or JGI-17040-92-MLS 1992-1999.\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":51374407221540,"sku":"SS106-6059","price":3238.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS106-6059.jpg?v=1765009885"},{"product_id":"ss106-6064","title":"76cc Cylinder Head Kit - Black. Fits Big Twin 1986-1999. - S\u0026S","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eFeatures \u0026amp; Benefits:-\u003c\/p\u003e\n\u003cp\u003e* 585″ Lift.\u003c\/p\u003e\n\u003cp\u003e* Works with 3-1\/2″ \u0026amp; 3-5\/8″ Cylinders.\u003c\/p\u003e\n\u003cp\u003e* Intake ports are the same size as OEM so the HD manifold bolts on.\u003c\/p\u003e\n\u003cp\u003e* Works with OEM style flat top pistons.\u003c\/p\u003e\n\u003cp\u003e* Front head is machined to accept OEM cyl head temp sensor on EFI models 1995-1998. \u003c\/p\u003e\n\u003cp\u003e* Slight increase in compression. CR = 8.8:1 using OEM pistons \u0026amp; 80ci barrels.\u003c\/p\u003e\n\u003cp\u003e* Compatible with any stock or aftermarket, standard or roller tipped rocker arms.\u003c\/p\u003e\n\u003cp\u003ePeople who Buy this\u003c\/p\u003e\n\u003cp\u003eProduct also Purchase:-\u003c\/p\u003e\n\u003cp\u003e* 3-1\/2″ OEM replacement Black Cylinders # SS910-0182 \u003c\/p\u003e\n\u003cp\u003e* Top End Gasket Kit #’s JGI-17033-83-MLS 1984-1991 or JGI-17040-92-MLS 1992-1999.\u003c\/p\u003e\n\u003cp\u003eProudly Made in the USA by S\u0026amp;S Cycle !\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SS","offers":[{"title":"Default Title","offer_id":51374407549220,"sku":"SS106-6064","price":3616.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/SS106-6064.jpg?v=1765009949"},{"product_id":"av-vsk6000s","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Beehive Springs with .600in. Lift. - AV\u0026V","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .600″\u003c\/p\u003e\n\u003cp\u003e* Beehive steel valve spring kit\u003c\/p\u003e\n\u003cp\u003e* Ultra pure chrome silicon+Nickle spring wire\u003c\/p\u003e\n\u003cp\u003e* Extra processing for fatigue resistance\u003c\/p\u003e\n\u003cp\u003e* Resist pressure loss \u0026amp; fatigue associated with extremely aggressive cams in high compression engines\u003c\/p\u003e\n\u003cp\u003e* Reduce vibration \u0026amp; harmonics\u003c\/p\u003e\n\u003cp\u003e* Includes springs,retainers \u0026amp; upper \u0026amp; lower collars\u003c\/p\u003e\n\u003cp\u003e* 162lbs @ 1.860″, 340lbs @ 1.260″\u003c\/p\u003e\n\u003cp\u003e* Coil bind 1.200″\u003c\/p\u003e\n\u003cp\u003e* Small end ID = .650″, OD= 1.085″\u003c\/p\u003e\n\u003cp\u003e* L\u003c\/p\u003e\n\u003cp\u003earge end ID = 1.000″, OD = 1.445″\u003c\/p\u003e\n\u003cp\u003e* CNC machined keepers\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AVV","offers":[{"title":"Default Title","offer_id":52205197951268,"sku":"AV-VSK6000S","price":358.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/AV-VSK6000S.jpg?v=1772973418"},{"product_id":"av-vsk600s","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Steel Double Springs with .600in. Lift. - AV\u0026V","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .600″\u003c\/p\u003e\n\u003cp\u003e* Steel Double Spring Kit\u003c\/p\u003e\n\u003cp\u003e* Ultra pure chrome silicon+Nickle spring wire\u003c\/p\u003e\n\u003cp\u003e* Extra processing for fatigue resistance\u003c\/p\u003e\n\u003cp\u003e* 1.375″ for better clearance inside rocker cvr\u003c\/p\u003e\n\u003cp\u003e* Springs feature chamfered tops to match smaller retainers\u003c\/p\u003e\n\u003cp\u003e* Includes springs,retainers \u0026amp; upper \u0026amp; lower collars\u003c\/p\u003e\n\u003cp\u003e* 155lbs@1.875, 175lbs@1.815″\u003c\/p\u003e\n\u003cp\u003e* coil bind 1.080″\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring tra\u003c\/p\u003e\n\u003cp\u003evel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AVV","offers":[{"title":"Default Title","offer_id":52205198115108,"sku":"AV-VSK600S","price":361.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/AV-VSK600S.jpg?v=1772973432"},{"product_id":"av-vsk6500","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Beehive Springs with .650in. Lift. - AV\u0026V","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .650″\u003c\/p\u003e\n\u003cp\u003e* Beehive steel valve spring kit\u003c\/p\u003e\n\u003cp\u003e* Ultra pure chrome silicon+Nickle spring wire\u003c\/p\u003e\n\u003cp\u003e* Extra processing for fatigue resistance\u003c\/p\u003e\n\u003cp\u003e* Resist pressure loss \u0026amp; fatigue associated with extremely aggressive cams in high compression engines\u003c\/p\u003e\n\u003cp\u003e* Reduce vibration \u0026amp; harmonics\u003c\/p\u003e\n\u003cp\u003e* Includes springs,retainers \u0026amp; upper \u0026amp; lower collars\u003c\/p\u003e\n\u003cp\u003e* 185lbs@1.860, 370lbs@1.250″\u003c\/p\u003e\n\u003cp\u003e* coil bind 1.150″\u003c\/p\u003e\n\u003cp\u003e* Small end ID = .740″, OD= 1.185″\u003c\/p\u003e\n\u003cp\u003e* Large\u003c\/p\u003e\n\u003cp\u003eend ID = 1.055″, OD = 1.500″\u003c\/p\u003e\n\u003cp\u003e* CNC machined keepers\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AVV","offers":[{"title":"Default Title","offer_id":52205198311716,"sku":"AV-VSK6500","price":362.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/AV-VSK6500.jpg?v=1772973447"},{"product_id":"av-vsk650s","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Steel Double Springs with .650in. Lift. - AV\u0026V","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .650″\u003c\/p\u003e\n\u003cp\u003e* Steel Double Spring Kit\u003c\/p\u003e\n\u003cp\u003e* Ultra pure chrome silicon+Nickle spring wire\u003c\/p\u003e\n\u003cp\u003e* Extra processing for fatigue resistance\u003c\/p\u003e\n\u003cp\u003e* 1.375″ for better clearance inside rocker cvr\u003c\/p\u003e\n\u003cp\u003e* Springs feature chamfered tops to match smaller retainers\u003c\/p\u003e\n\u003cp\u003e* Includes springs,retainers \u0026amp; upper \u0026amp; lower collars\u003c\/p\u003e\n\u003cp\u003e* 185lbs @ 1.860, 460lbs @ 1.160″\u003c\/p\u003e\n\u003cp\u003e* Coil bind 1.080″\u003c\/p\u003e\n\u003cp\u003e* Maximum lift = .650″\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance m\u003c\/p\u003e\n\u003cp\u003eust be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AVV","offers":[{"title":"Default Title","offer_id":52205199556900,"sku":"AV-VSK650S","price":449.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/AV-VSK650S.jpg?v=1772973537"},{"product_id":"av-vsk675t","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Steel Double Springs with .675in. Lift. Titanium Retainers! - AV\u0026V","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003e* Extreme Duty Valve Spring Kit – Titanium Retainers – .675″ Lift\u003c\/p\u003e\n\u003cp\u003e* Specifically designed \u0026amp; processed with extra shot peening \u0026amp; nitrided to resist failure under the most extreme conditions.\u003c\/p\u003e\n\u003cp\u003e* For use with serious high performance cams 0.640-.675″ lift\u003c\/p\u003e\n\u003cp\u003e* Includes springs,retainers \u0026amp; upper \u0026amp; lower collars\u003c\/p\u003e\n\u003cp\u003e* 185lbs @ 1.860, 460lbs @ 1.160″\u003c\/p\u003e\n\u003cp\u003e* Coil bind 1.080″\u003c\/p\u003e\n\u003cp\u003e* Maximum lift = .675″\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Sprin\u003c\/p\u003e\n\u003cp\u003eg travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AVV","offers":[{"title":"Default Title","offer_id":52205202538788,"sku":"AV-VSK675T","price":813.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/AV-VSK675T.jpg?v=1772973740"},{"product_id":"kpm-20-22600","title":"Valve Kit. Fits Evolution Big Twin 1984-1999 - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eKit Includes:\u003c\/p\u003e\n\u003cp\u003e* A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter)\u003c\/p\u003e\n\u003cp\u003e* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench.\u003c\/p\u003e\n\u003cp\u003e* Replaces OEM # 180\u003c\/p\u003e\n\u003cp\u003e74-83 \u0026amp; 18082-83\u003c\/p\u003e\n\n\u003cp\u003eSuggested Additional Purchase:-\u003c\/p\u003e\n\u003cp\u003eTop End Gasket Kit # CG-C9747 or CG-C9635\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949309616420,"sku":"KPM-20-22600","price":301.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-22600.jpg?v=1778593829"},{"product_id":"kpm-20-21300","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Beehive Springs with .610in. Lift - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eBy taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson applications. By coupling these developments with strict KPMI design protocols and employing multiple design, simulation, and FEA analysis software, we were we able to overcome the torsional stresses unique to ovate wire springs that previously severely limited their operating p \u003c\/p\u003e\n\u003cp\u003earameters.\u003c\/p\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .610″\u003c\/p\u003e\n\u003cp\u003eInstalled Height: 1.860″\u003c\/p\u003e\n\u003cp\u003eSeat Pressure: 175#\u003c\/p\u003e\n\u003cp\u003eOpen Pressure: 400#\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949310730532,"sku":"KPM-20-21300","price":345.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-21300.jpg?v=1778593842"},{"product_id":"kpm-20-20132","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Steel Double Springs with .600in. Lift - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eSince 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.\u003c\/p\u003e\n\n\u003cp\u003eNote: Maximum Recommended Lift = .600″\u003c\/p\u003e\n\u003cp\u003eInstalled Height: 1.810″\u003c\/p\u003e\n\u003cp\u003eSeat Pressure: 163#\u003c\/p\u003e\n\u003cp\u003eOpen Pressure: 361#\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e*\u003c\/p\u003e\n\u003cp\u003eRocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949311025444,"sku":"KPM-20-20132","price":376.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-20132.jpg?v=1778593853"},{"product_id":"kpm-20-21500","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Beehive Springs with .660in. Lift - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eBy taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI® has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson® applications. By coupling these developments with strict KPMI® design protocols and employing multiple design, simulation, and FEA analysis software, we were we able to overcome the torsional stresses unique to ovate wire springs that previously severely limited their operatin \u003c\/p\u003e\n\u003cp\u003eg parameters.\u003c\/p\u003e\n\u003cp\u003eNote: Maximum Recommended Lift = .660″\u003c\/p\u003e\n\u003cp\u003eInstalled Height: 1.860″\u003c\/p\u003e\n\u003cp\u003eSeat Pressure: 178#\u003c\/p\u003e\n\u003cp\u003eOpen Pressure: 371#\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e* Rocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949311058212,"sku":"KPM-20-21500","price":380.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-21500.jpg?v=1778593854"},{"product_id":"kpm-20-21650","title":"Valve Spring Kit. Fits Big Twin 1984-2004, Sportster \u0026 Buell 1986-2003. Steel Double Springs with .650in. Lift - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003eSince 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.\u003c\/p\u003e\n\n\u003cp\u003eNote: Maximum Recommended Lift = .650″\u003c\/p\u003e\n\u003cp\u003eInstalled Height: 1.860″\u003c\/p\u003e\n\u003cp\u003eSeat Pressure: 185#\u003c\/p\u003e\n\u003cp\u003eOpen Pressure: 440#\u003c\/p\u003e\n\n\u003cp\u003eTech Tips:-\u003c\/p\u003e\n\u003cp\u003e*\u003c\/p\u003e\n\u003cp\u003eRocker box clearance must be checked\u003c\/p\u003e\n\u003cp\u003e* Spring travel must be checked \u003c\/p\u003e\n\u003cp\u003e* Valve timing must be accurate\u003c\/p\u003e\n\u003cp\u003e** Over revving will lead to pre-mature failure of Valve Springs \u0026amp; collars.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949311156516,"sku":"KPM-20-21650","price":400.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-21650.jpg?v=1778593859"},{"product_id":"kpm-20-22650","title":"Valve \u0026 Spring Engine Kit. Fits Evolution Big Twin 1984-1999 - Kibblewhite","description":"\u003cdiv class=\"elementor-widget-container\"\u003e\n\u003cp\u003e* Save time money when purchasing this kit\u003c\/p\u003e\n\u003cp\u003e* One package, everything you need for a cylinder head overhaul\u003c\/p\u003e\n\u003cp\u003e* Double your service life over OEM using KPMI Valvetrain products\u003c\/p\u003e\n\n\u003cp\u003eKit Includes:\u003c\/p\u003e\n\u003cp\u003e* KPMI complete 0.600″ Lift Valve Spring Kit (meets or exceeds OEM)\u003c\/p\u003e\n\u003cp\u003e* Seals \u0026amp; Keepers\u003c\/p\u003e\n\u003cp\u003e* KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter)\u003c\/p\u003e\n\n\u003cp\u003eSuggested Additional Purchase:-\u003c\/p\u003e\n\u003cp\u003eTop End Gasket Kit # CG-C9747 or CG-C9635\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIBBLEWHITE","offers":[{"title":"Default Title","offer_id":53949311516964,"sku":"KPM-20-22650","price":587.99,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/9201\/3860\/files\/KPM-20-22650.jpg?v=1778593880"}],"url":"https:\/\/www.proclasscustoms.co.nz\/collections\/cylinder-heads-parts-evo.oembed?page=2","provider":"Pro Class Customs","version":"1.0","type":"link"}