{"title":"Cylinder Heads","description":"","products":[{"product_id":"honda-k20-cylinder-head-be-cu","title":"Bourne HPP Honda K20 Cylinder Head (With Beryllium Guides \u0026 Seats)","description":"\u003cdiv dir=\"ltr\" aria-busy=\"false\" aria-live=\"polite\" id=\"model-response-message-contentr_7f611c4a0a730fbc\" class=\"markdown markdown-main-panel stronger enable-updated-hr-color\"\u003e\n\u003ch3\u003e\u003cstrong\u003ePrecision Engineering for High-Performance Reliability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBourne HPP K20 Cylinder Head with Beryllium Copper (Be-Cu) Valve Guides \u0026amp; Seats\u003c\/strong\u003e is the premium choice for serious Honda K-Series builders who demand superior thermal management and durability under extreme conditions. By replacing standard OE steel components with advanced Beryllium Copper, this cylinder head solves the critical issues of heat dissipation and valve sealing often found in high-rpm or forced induction applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperior Sealing and Conformity\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAchieving a perfect seal is critical for maximizing compression and power. Beryllium Copper is softer than OE steel, allowing the valve seats to lap in more easily and conform precisely to the valve face.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eEnhanced Seal Integrity: The material's unique properties allow for a tighter seal that steel cannot replicate, drastically reducing the tiny percentage of leak-down common in standard heads.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eReduced Expansion: Be-Cu expands significantly less than steel under operating temperatures, maintaining consistent geometry and preventing the thermal distortion that leads to sealing loss.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAdvanced Thermal Management\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eHeat is the enemy of performance, particularly on the exhaust side. Be-Cu is an exceptional thermal conductor, far outperforming standard steel alloys.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cstrong\u003eRapid Heat Dissipation:\u003c\/strong\u003e It actively pulls heat away from the valves (especially critical for exhaust valves), lowering combustion chamber temperatures and reducing the risk of detonation.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cstrong\u003eStable Tolerances:\u003c\/strong\u003e Because the material sheds heat so effectively, the guides maintain better concentricity. This ensures the guide holds the optimal oil film and valve stem tolerance, leading to significantly less wear on both the valve and the guide itself.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDurability at High RPM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eReliability at the redline is non-negotiable. Beryllium Copper is naturally resistant to galling due to its material composition. In high-RPM applications where valve speeds are extreme, you are far less likely to damage a guide. This upgrade ensures your valvetrain moves smoothly, cycle after cycle.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBetter Heat Dissipation:\u003c\/strong\u003e Keeps valves cooler and maintains performance consistency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImproved Sealing:\u003c\/strong\u003e Superior conformity for maximum compression.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLonger Valve Life:\u003c\/strong\u003e Reduced friction and better oil film retention protect your investment.\u003c\/p\u003e\n\u003cp\u003eRead more on \u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ca style=\"color: rgb(255, 42, 0);\" rel=\"noopener\" href=\"https:\/\/bournehpp.com\/blogs\/news\/beryllium-copper-cylinder-head-upgrade\" target=\"_blank\"\u003eWhy Beryllium Copper (Be-Cu) Seats \u0026amp; Guides are the Ultimate Upgrade.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Beryllium Copper (Be-Cu) Guides \u0026amp; Seats\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Honda K20 \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e High RPM Naturally Aspirated \/ Forced Induction \/ Track Use\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBuild Options:\u003cbr\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTurbo:\u003c\/strong\u003e Our Turbo cylinder heads retain standard inlet and exhaust ports. With boost doing the work of filling the cylinder, the OE port design provides a proven, reliable base for forced induction builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHand Ported:\u003c\/strong\u003e Our Hand Ported cylinder heads feature complete inlet and exhaust porting to optimize flow for high-power, track-focused, naturally aspirated engines. Each head is ported with port velocity in mind, which is crucial for on-track performance. The result is strong, usable power across the rev range rather than just a peak dyno figure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe also offer this service on an exchange basis. Please select 'Cylinder Head Exchange' and contact us with your order number.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-path-to-node=\"10\"\u003e\n\u003c\/div\u003e","brand":"Bourne HPP","offers":[{"title":"Turbo \/ Cylinder Head Required","offer_id":56613001789815,"sku":"BHP-K20CHB-CC-1","price":1486.0,"currency_code":"GBP","in_stock":true},{"title":"Turbo \/ Cylinder Head Exchange","offer_id":56613001822583,"sku":"BHP-K20CHB-CC-2","price":1306.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Required","offer_id":57737575367031,"sku":"BHP-K20CHB-CC-3","price":1886.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Exchange","offer_id":57737575399799,"sku":"BHP-K20CHB-CC-4","price":1706.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/5592\/4087\/files\/BourneHP_K20_Cylinder_Head_2.png?v=1771952761"},{"product_id":"honda-f20c-s2000-cylinder-head-be-cu","title":"Bourne HPP Honda F20C S2000 Cylinder Head (With Beryllium Guides \u0026 Seats)","description":"\u003ch3\u003e\u003cstrong\u003ePrecision Engineering for High-Performance Reliability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBourne HPP F20C S2000 Cylinder Head with Beryllium Copper (Be-Cu) Valve Guides \u0026amp; Seats\u003c\/strong\u003e is the premium choice for serious Honda S2000 builders who demand superior thermal management and durability under extreme conditions. By replacing standard OE steel components with advanced Beryllium Copper, this cylinder head solves the critical issues of heat dissipation and valve sealing often found in high-rpm or forced induction applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperior Sealing and Conformity\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAchieving a perfect seal is critical for maximizing compression and power. Beryllium Copper is softer than OE steel, allowing the valve seats to lap in more easily and conform precisely to the valve face.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eEnhanced Seal Integrity: The material's unique properties allow for a tighter seal that steel cannot replicate, drastically reducing the tiny percentage of leak-down common in standard heads.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eReduced Expansion: Be-Cu expands significantly less than steel under operating temperatures, maintaining consistent geometry and preventing the thermal distortion that leads to sealing loss.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAdvanced Thermal Management\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eHeat is the enemy of performance, particularly on the exhaust side. Be-Cu is an exceptional thermal conductor, far outperforming standard steel alloys.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cstrong\u003eRapid Heat Dissipation:\u003c\/strong\u003e It actively pulls heat away from the valves (especially critical for exhaust valves), lowering combustion chamber temperatures and reducing the risk of detonation.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cstrong\u003eStable Tolerances:\u003c\/strong\u003e Because the material sheds heat so effectively, the guides maintain better concentricity. This ensures the guide holds the optimal oil film and valve stem tolerance, leading to significantly less wear on both the valve and the guide itself.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDurability at High RPM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eReliability at the redline is non-negotiable. Beryllium Copper is naturally resistant to galling due to its material composition. In high-RPM applications where valve speeds are extreme, you are far less likely to damage a guide. This upgrade ensures your valvetrain moves smoothly, cycle after cycle.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBetter Heat Dissipation:\u003c\/strong\u003e Keeps valves cooler and maintains performance consistency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImproved Sealing:\u003c\/strong\u003e Superior conformity for maximum compression.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLonger Valve Life:\u003c\/strong\u003e Reduced friction and better oil film retention protect your investment.\u003c\/p\u003e\n\u003cp\u003eRead more on \u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ca href=\"https:\/\/bournehpp.com\/blogs\/news\/beryllium-copper-cylinder-head-upgrade\" rel=\"noopener\" style=\"color: rgb(255, 42, 0);\" target=\"_blank\"\u003eWhy Beryllium Copper (Be-Cu) Seats \u0026amp; Guides are the Ultimate Upgrade.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Beryllium Copper (Be-Cu) Guides \u0026amp; Seats\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Honda F20C (S2000)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e High RPM Naturally Aspirated \/ Forced Induction \/ Track Use\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBuild Options:\u003cbr\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTurbo:\u003c\/strong\u003e Our Turbo cylinder heads retain standard inlet and exhaust ports. With boost doing the work of filling the cylinder, the OE port design provides a proven, reliable base for forced induction builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHand Ported:\u003c\/strong\u003e Our Hand Ported cylinder heads feature complete inlet and exhaust porting to optimize flow for high-power, track-focused, naturally aspirated engines. Each head is ported with port velocity in mind, which is crucial for on-track performance. The result is strong, usable power across the rev range rather than just a peak dyno figure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe also offer this service on an exchange basis. Please select 'Cylinder Head Exchange' and contact us with your order number.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Bourne HPP","offers":[{"title":"Turbo \/ Cylinder Head Required","offer_id":56926323769719,"sku":"BHP-F20C-CHBC-1","price":1486.0,"currency_code":"GBP","in_stock":true},{"title":"Turbo \/ Cylinder Head Exchange","offer_id":56926323802487,"sku":"BHP-F20C-CHBC-2","price":1306.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Required","offer_id":57737575793015,"sku":"BHP-F20C-CHBC-3","price":1886.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Exchange","offer_id":57737575825783,"sku":"BHP-F20C-CHBC-4","price":1706.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/5592\/4087\/files\/Bourne_HPP_Honda_S2000_Cylinder_Head_Beryllium_Guides_and_Seats_1.png?v=1774364031"},{"product_id":"honda-k24-cylinder-head-be-cu","title":"Bourne HPP Honda K24 Cylinder Head (With Beryllium Guides \u0026 Seats)","description":"\u003ch3\u003e\u003cstrong\u003ePrecision Engineering for High-Performance Reliability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBourne HPP K24 Cylinder Head with Beryllium Copper (Be-Cu) Valve Guides \u0026amp; Seats\u003c\/strong\u003e is the premium choice for serious Honda K24 builders who demand superior thermal management and durability under extreme conditions. By replacing standard OE steel components with advanced Beryllium Copper, this cylinder head solves the critical issues of heat dissipation and valve sealing often found in high-rpm or forced induction applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperior Sealing and Conformity\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eAchieving a perfect seal is critical for maximizing compression and power. Beryllium Copper is softer than OE steel, allowing the valve seats to lap in more easily and conform precisely to the valve face.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eEnhanced Seal Integrity: The material's unique properties allow for a tighter seal that steel cannot replicate, drastically reducing the tiny percentage of leak-down common in standard heads.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eReduced Expansion: Be-Cu expands significantly less than steel under operating temperatures, maintaining consistent geometry and preventing the thermal distortion that leads to sealing loss.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAdvanced Thermal Management\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eHeat is the enemy of performance, particularly on the exhaust side. Be-Cu is an exceptional thermal conductor, far outperforming standard steel alloys.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cstrong\u003eRapid Heat Dissipation:\u003c\/strong\u003e It actively pulls heat away from the valves (especially critical for exhaust valves), lowering combustion chamber temperatures and reducing the risk of detonation.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cstrong\u003eStable Tolerances:\u003c\/strong\u003e Because the material sheds heat so effectively, the guides maintain better concentricity. This ensures the guide holds the optimal oil film and valve stem tolerance, leading to significantly less wear on both the valve and the guide itself.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDurability at High RPM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eReliability at the redline is non-negotiable. Beryllium Copper is naturally resistant to galling due to its material composition. In high-RPM applications where valve speeds are extreme, you are far less likely to damage a guide. This upgrade ensures your valvetrain moves smoothly, cycle after cycle.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBetter Heat Dissipation:\u003c\/strong\u003e Keeps valves cooler and maintains performance consistency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImproved Sealing:\u003c\/strong\u003e Superior conformity for maximum compression.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLonger Valve Life:\u003c\/strong\u003e Reduced friction and better oil film retention protect your investment.\u003c\/p\u003e\n\u003cp\u003eRead more on \u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ca style=\"color: rgb(255, 42, 0);\" rel=\"noopener\" href=\"https:\/\/bournehpp.com\/blogs\/news\/beryllium-copper-cylinder-head-upgrade\" target=\"_blank\"\u003eWhy Beryllium Copper (Be-Cu) Seats \u0026amp; Guides are the Ultimate Upgrade.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Beryllium Copper (Be-Cu) Guides \u0026amp; Seats\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Honda K24\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e High RPM Naturally Aspirated \/ Forced Induction \/ Track Use\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBuild Options:\u003cbr\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTurbo:\u003c\/strong\u003e Our Turbo cylinder heads retain standard inlet and exhaust ports. With boost doing the work of filling the cylinder, the OE port design provides a proven, reliable base for forced induction builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHand Ported:\u003c\/strong\u003e Our Hand Ported cylinder heads feature complete inlet and exhaust porting to optimize flow for high-power, track-focused, naturally aspirated engines. Each head is ported with port velocity in mind, which is crucial for on-track performance. The result is strong, usable power across the rev range rather than just a peak dyno figure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe also offer this service on an exchange basis. Please select 'Cylinder Head Exchange' and contact us with your order number.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Bourne HPP","offers":[{"title":"Turbo \/ Cylinder Head Required","offer_id":57010906923383,"sku":"BHP-K24-CHBC-1","price":1486.0,"currency_code":"GBP","in_stock":true},{"title":"Turbo \/ Cylinder Head Exchange","offer_id":57010906956151,"sku":"BHP-K24-CHBC-2","price":1306.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Required","offer_id":57737575956855,"sku":"BHP-K24-CHBC-3","price":1886.0,"currency_code":"GBP","in_stock":true},{"title":"Hand Ported \/ Cylinder Head Exchange","offer_id":57737575989623,"sku":"BHP-K24-CHBC-4","price":1706.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/5592\/4087\/files\/Bourne_HPP_Honda_K24_Cylinder_Head_Beryllium_Guides_and_Seats_1.png?v=1776252836"},{"product_id":"bourne-honda-k24-complete-cylinder-head","title":"Bourne Honda K24 Complete Pre-Assembled Cylinder Head","description":"\u003ch2 data-path-to-node=\"0\"\u003eBourne HPP Honda K24 Pre-Assembled Cylinder Head\u003c\/h2\u003e\n\u003cp data-path-to-node=\"1\"\u003eElevate your Honda K-Series build with the \u003cb data-path-to-node=\"1\" data-index-in-node=\"43\"\u003eBourne HPP Pre-Assembled Cylinder Head\u003c\/b\u003e, a turnkey solution designed for elite level power and reliability. \u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eBy integrating advanced thermal management with high-strength valvetrain components, this assembly solves the most common failure points found in high-RPM and high-boost K24 applications.\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"4\"\u003eKey Assembly Features\u003c\/h3\u003e\n\u003ch4 data-path-to-node=\"5\"\u003e1. \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/bournehpp.com\/products\/honda-k24-cylinder-head-be-cu\" target=\"_blank\" title=\"Bourne HPP K24 Cylinder Head\" style=\"color: rgb(255, 42, 0);\" rel=\"noopener\"\u003eBourne HPP K24 Head with Beryllium Copper (Be-Cu) Seats \u0026amp; Guides\u003c\/a\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe heart of this assembly is the upgraded cylinder head featuring Beryllium Copper seats and guides. This material is the gold standard for racing engines:\u003c\/p\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003eRapid Heat Dissipation:\u003c\/b\u003e Be-Cu pulls heat away from the valves significantly faster than steel, lowering combustion temperatures and preventing detonation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003eSuperior Sealing:\u003c\/b\u003e The slightly softer nature of Be-Cu allows for better conformity between the valve face and the seat, resulting in near-zero leak-down.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,0\"\u003e\u003cb data-path-to-node=\"7,2,0\" data-index-in-node=\"0\"\u003eExtreme Durability:\u003c\/b\u003e Naturally resistant to galling and thermal distortion, ensuring your valvetrain geometry remains perfect even at high RPMs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"8\"\u003e2. Choice of Premium Valve Springs\u003c\/h4\u003e\n\u003cp data-path-to-node=\"9\"\u003eWe offer two industry-leading options to eliminate valve float and ensure the engine breathes accurately at the redline:\u003c\/p\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003ca href=\"https:\/\/bournehpp.com\/products\/bourne-hpp-inlet-exhaust-valve-spring-set-honda-k20-k24\" target=\"_blank\" title=\"Bourne HPP K20, K24 valve spring set\" rel=\"noopener\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eBourne HPP Valve Springs\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003e:\u003c\/b\u003e The in-house precision choice. Manufactured from Silicon Chrome (SiCr) for maximum fatigue resistance and rated for \u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"147\"\u003e350–700 HP\u003c\/b\u003e in boosted applications. Designed for a straightforward fitment using original platform shims and retainers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eSupertech K20\/K24 Valve Spring Kit:\u003c\/b\u003e The global industry standard. Perfect for builders who prefer brand consistency with other Supertech components, offering proven high-RPM stability and compatibility with aggressive aftermarket cams.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"11\"\u003e3. \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ca href=\"https:\/\/bournehpp.com\/products\/bourne-hpp-inlet-exhaust-valve-set-honda-k20-k24\" target=\"_blank\" title=\"Bourne HPP K20 K24 Inlet and Exhaust Valve Set\" style=\"color: rgb(255, 42, 0);\" rel=\"noopener\"\u003eBourne HPP Valve Set\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp data-path-to-node=\"12\"\u003eThe valvetrain is completed with our high-grade EN52 steel valves, designed for maximum flow and durability.\u003c\/p\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003eSuper Polished Finish:\u003c\/b\u003e Reduces carbon buildup and optimizes airflow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003ePulse Plasma Nitriding:\u003c\/b\u003e Creates an ultra-hard surface that reduces friction within the guides and extends the lifespan of the entire valvetrain.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"15\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable data-path-to-node=\"16\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,1,0,0\"\u003e\u003cb data-path-to-node=\"16,1,0,0\" data-index-in-node=\"0\"\u003eEngine Fitment\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,1,1,0\"\u003eHonda K24 \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,2,0,0\"\u003e\u003cb data-path-to-node=\"16,2,0,0\" data-index-in-node=\"0\"\u003eSeat\/Guide Material\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,2,1,0\"\u003eBeryllium Copper (Be-Cu)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,3,0,0\"\u003e\u003cb data-path-to-node=\"16,3,0,0\" data-index-in-node=\"0\"\u003eValve Material\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,3,1,0\"\u003eEN52 Steel (Pulse Plasma Nitrided)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,4,0,0\"\u003e\u003cb data-path-to-node=\"16,4,0,0\" data-index-in-node=\"0\"\u003eSpring Options\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,4,1,0\"\u003e\u003cb data-path-to-node=\"16,4,1,0\" data-index-in-node=\"0\"\u003eBourne HPP\u003c\/b\u003e OR \u003cb data-path-to-node=\"16,4,1,0\" data-index-in-node=\"21\"\u003eSupertech\u003c\/b\u003e \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,5,0,0\"\u003e\u003cb data-path-to-node=\"16,5,0,0\" data-index-in-node=\"0\"\u003ePower Rating\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,5,1,0\"\u003e200–350 HP (NA) \/ 350–700 HP (Boosted)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,6,0,0\"\u003e\u003cb data-path-to-node=\"16,6,0,0\" data-index-in-node=\"0\"\u003eValve Count\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"16,6,1,0\"\u003e8x Inlet, 8x Exhaust\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-path-to-node=\"18\"\u003e\n\u003cbr\u003eWhy Choose a Pre-Assembled Head?\u003c\/h3\u003e\n\u003cp data-path-to-node=\"19\"\u003eBuilding a high-performance head requires meticulous measurement of installed heights, guide clearances, and coil bind. When you purchase this pre-assembled unit, you are receiving a \u003cb data-path-to-node=\"19\" data-index-in-node=\"183\"\u003ecompetition-ready\u003c\/b\u003e component. Every valve is lapped, every spring is checked, and every tolerance is verified by Bourne HPP technicians.\u003c\/p\u003e\n\u003cp data-path-to-node=\"20\"\u003e\u003cb data-path-to-node=\"20\" data-index-in-node=\"0\"\u003eBest For:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"21\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,0,0\"\u003eHigh-RPM Naturally Aspirated Track Builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,1,0\"\u003eHigh-Boost Forced Induction (Turbo\/Supercharged)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,2,0\"\u003eCompetitive Endurance Racing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote data-path-to-node=\"22\"\u003e\n\u003cp data-path-to-node=\"22,0\"\u003e\u003cb data-path-to-node=\"22,0\" data-index-in-node=\"0\"\u003eService Note:\u003c\/b\u003e We also offer this specification as a service to your existing cylinder head or on an exchange basis. Please contact us for details on core returns.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"Bourne HPP","offers":[{"title":"Bourne HPP Valve Spring kit","offer_id":57037762953591,"sku":"BHP-K24-CHC-1","price":3033.0,"currency_code":"GBP","in_stock":false},{"title":"Supertech Valve Spring kit","offer_id":57037762986359,"sku":"BHP-K24-CHC-2","price":3250.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/5592\/4087\/files\/Bourne_Honda_K24_Complete_Cylinder_Head_1.png?v=1776935586"}],"url":"https:\/\/bournehpp.com\/collections\/cylinder-heads.oembed","provider":"Bourne HPP LTD","version":"1.0","type":"link"}