{"product_id":"kb-pistons-forged-alloy-piston-pistons-evo-80ci-10-5-1-005-824-01613","title":"Kb Pistons Forged Alloy Piston 10.5:1 .005 Oversized - Harley Evolution 80ci","description":"\u003c!-- vt:seo-start --\u003e\n\u003cdiv class=\"vt-brand-bio\" style=\"background:#f6f6f6;border-left:4px solid #c8102e;padding:14px 18px;margin:0 0 20px;border-radius:4px;\"\u003e\n\u003ch2 style=\"margin:0 0 6px;font-size:1.05em;\"\u003eAbout Kb Pistons\u003c\/h2\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.6;\"\u003eKB Performance Pistons builds hypereutectic and forged pistons for American V-twin engines, and is a long-standing choice for big-bore and stock-replacement rebuilds where budget and durability both matter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"line-height:1.65;\"\u003eUnleash the full potential of your Evolution 80ci engine with Kb Pistons forged alloy pistons. Designed for riders pushing the limits, these pistons deliver the durability and performance needed for high-output street or race applications.\u003c\/p\u003e\n\u003ch3 style=\"margin:20px 0 6px;\"\u003eWhy riders pick this\u003c\/h3\u003e\u003cul style=\"padding-left:20px;margin:0 0 16px;\"\u003e\n\u003cli style=\"margin:3px 0;\"\u003e4032 forged alloy construction for extreme durability\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eSuperior crack resistance under detonation and pre-ignition\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eOptimized for high-compression street or race applications\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eIncludes rings, wrist pins, and wrist pin locks for complete assembly\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003e.005 oversized for precision engine rebuilding\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen you're building an Evolution 80ci that's going to see serious power, stock pistons just won't cut it. Kb Pistons forged alloy pistons are engineered to stand up to the extreme pressures of detonation and pre-ignition, making them ideal for builds running power adders like NOS or turbo boost. This .005 oversized set with a 10.5:1 compression ratio is ready to transform your motor into a powerhouse.\u003c\/p\u003e\n\u003ch3\u003eBuilt for Boost and High Compression\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConstructed from 4032 forged alloy with 11% silicon content\u003c\/li\u003e\n\u003cli\u003eEngineered for superior crack resistance under extreme heat and pressure\u003c\/li\u003e\n\u003cli\u003eDesigned for high-performance street or race builds with power adders\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary rings, wrist pins, and wrist pin locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Foundation for a Serious Build\u003c\/h3\u003e\n\u003cp\u003eWhether you're refreshing an EVO or chasing every last bit of power, these Kb Pistons provide a critical upgrade. Their robust construction ensures reliability when pushing higher compression ratios or introducing forced induction, giving you confidence on the street or the strip. Pair these with a performance cam and a proper dyno tune for a truly uncorked Evolution motor.\u003c\/p\u003e\n\u003ch3 style=\"margin:20px 0 6px;\"\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e KB Pistons\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e KB921C.005\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 800745155368\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e .005 oversized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 10.5:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e EVO 80ci\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.5 lbs per pair\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Mexico\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eCommon questions\u003c\/h3\u003e\u003cdiv class=\"vt-faq\"\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eWhat's included with this piston set?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eEach set includes a pair of pistons, all necessary rings, wrist pins, and wrist pin locks, providing everything you need for installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eAre these pistons suitable for boosted applications?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eYes, these pistons are specifically designed with superior crack resistance to handle the demands of power adders like NOS or turbo boost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eDo I need to bore my cylinders for these pistons?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eThese are .005 oversized pistons, so your cylinders will need to be bored and honed to the correct specification for proper fitment. Always confirm with your engine builder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"vt-confidence\" style=\"border-top:1px solid #e5e5e5;margin:24px 0 0;padding:16px 0 0;font-size:0.92em;line-height:1.6;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOrdering from Vtwinbikers\u003c\/h3\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli\u003eBrand new, sourced through authorized US distribution — never used, never grey-market.\u003c\/li\u003e\n\u003cli\u003eNot sure it fits? Use \u003cstrong\u003eShop by Bike\u003c\/strong\u003e to filter by your year and model, or email us and we will confirm before you order.\u003c\/li\u003e\n\u003cli\u003eHarley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vtwinbikers.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Piston kits \u0026 Components\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/all\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Kb Pistons\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/kb-pistons\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Kb Pistons Forged Alloy Piston 10.5:1 .005 Oversized - Harley Evolution 80ci\",\"item\":\"https:\/\/vtwinbikers.com\/products\/kb-pistons-forged-alloy-piston-pistons-evo-80ci-10-5-3\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included with this piston set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Each set includes a pair of pistons, all necessary rings, wrist pins, and wrist pin locks, providing everything you need for installation.\"}},{\"@type\":\"Question\",\"name\":\"Are these pistons suitable for boosted applications?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, these pistons are specifically designed with superior crack resistance to handle the demands of power adders like NOS or turbo boost.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to bore my cylinders for these pistons?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These are .005 oversized pistons, so your cylinders will need to be bored and honed to the correct specification for proper fitment. Always confirm with your engine builder.\"}}]}\u003c\/script\u003e\n\u003c!-- vt:seo-end --\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035468980335,"sku":"824-01613","price":313.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_19c4af2d-53c7-443b-83f0-954dcd331fc9.png?v=1779561777","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-forged-alloy-piston-pistons-evo-80ci-10-5-1-005-824-01613","provider":"Vtwinbikers","version":"1.0","type":"link"}