{"product_id":"wiseco-black-edition-piston-kit-tc-103-cid-9-6-1-010-k2791","title":"Wiseco Black Edition Piston Kit TC 103 CID 9.6:1 +.010 Oversize - Harley Twin Cam","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 Wiseco\u003c\/h2\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.6;\"\u003eWiseco has forged pistons in Mentor, Ohio since 1941, supplying everything from factory race teams to big-bore street builds. Forged construction is what lets a V-twin survive higher compression and more cylinder pressure than the stock cast piston was designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"line-height:1.65;\"\u003eThe Wiseco Black Edition piston kit is specifically for Twin Cam 103 CID engines, featuring a 9.6:1 compression ratio and a +.010 oversized bore. Constructed from forged aluminum, this kit includes a premium ring package and dual thermal coatings for enhanced durability, superior oil control, and reduced friction in high-performance V-twin builds.\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;\"\u003eAchieves 9.6:1 compression ratio with a +.010 oversize bore\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eForged aluminum construction for extreme strength\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eArmor X and ArmorGlide coatings reduce wear and friction\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003ePremium ring package ensures superior oil control\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eCompatible with OEM and Screamin' Eagle cylinder heads\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eDesigned for high-performance Twin Cam 103 builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen your Twin Cam 103 is ready for a serious performance boost and requires a bore clean-up, the Wiseco Black Edition piston kit with a 9.6:1 compression ratio and +.010 oversize is the ideal solution. These forged aluminum pistons are built to withstand the rigors of high-performance riding, providing a significant increase in compression that translates directly into more power and torque. The advanced coatings and meticulous design ensure both longevity and optimal engine efficiency.\u003c\/p\u003e\u003ch3\u003eBuilt for High-Performance Demands\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePremium compression ring for an ultimate ring seal and maximum power\u003c\/li\u003e\n\u003cli\u003eNapier second ring with taper face and underhook for superior oil control\u003c\/li\u003e\n\u003cli\u003e3mm oil ring design with higher tension for enhanced oil management\u003c\/li\u003e\n\u003cli\u003eArmor X piston coating significantly reduces wear under extreme conditions\u003c\/li\u003e\n\u003cli\u003eArmorGlide skirt coating minimizes friction and improves scuff resistance for quieter operation\u003c\/li\u003e\n\u003cli\u003eCompatible with both OEM and Screamin' Eagle cylinder heads\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Core of a Powerful Build\u003c\/h3\u003e\u003cp\u003eThis +.010 oversize kit is perfect for Twin Cam 103 engines undergoing a bore and hone, offering a fresh start with increased compression. The 9.6:1 ratio is a popular choice for riders seeking a noticeable power gain, especially when paired with an appropriate cam and a professional dyno tune. Invest in the foundation of your engine's performance with Wiseco's proven Black Edition pistons.\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 Wiseco\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e K2791\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine Size:\u003c\/strong\u003e Twin Cam 103 CID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 9.6:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e +.010 oversized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 9 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 4 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 4 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.4 lbs\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 compression ratio does this piston give me?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eThis piston kit provides a 9.6:1 compression ratio. This is a higher compression ratio suitable for performance builds and will typically require a proper engine tune.\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;\"\u003eWhy is the piston oversized?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eThe +.010 oversized bore is typically used when the cylinder requires machining to clean up the bore, allowing for a fresh, precise fit during a rebuild or performance upgrade.\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 a special tune for these pistons?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eYes, due to the increased compression ratio and oversized bore, a professional dyno tune is highly recommended to optimize your engine's performance and ensure proper fuel mapping and timing.\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\":\"Black\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/all\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Wiseco\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/wiseco\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Wiseco Black Edition Piston Kit TC 103 CID 9.6:1 +.010 Oversize - Harley Twin Cam\",\"item\":\"https:\/\/vtwinbikers.com\/products\/wiseco-black-edition-piston-kit-tc-103-cid-9-6-1-010-k2791\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What compression ratio does this piston give me?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This piston kit provides a 9.6:1 compression ratio. This is a higher compression ratio suitable for performance builds and will typically require a proper engine tune.\"}},{\"@type\":\"Question\",\"name\":\"Why is the piston oversized?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The +.010 oversized bore is typically used when the cylinder requires machining to clean up the bore, allowing for a fresh, precise fit during a rebuild or performance upgrade.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a special tune for these pistons?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, due to the increased compression ratio and oversized bore, a professional dyno tune is highly recommended to optimize your engine's performance and ensure proper fuel mapping and timing.\"}}]}\u003c\/script\u003e\n\u003c!-- vt:seo-end --\u003e","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":53035857838191,"sku":"K2791","price":576.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/1f79-5d4da6c85ea1e_895af827-1d7d-4ebe-9026-a33982f57742.jpg?v=1777529783","url":"https:\/\/vtwinbikers.com\/products\/wiseco-black-edition-piston-kit-tc-103-cid-9-6-1-010-k2791","provider":"Vtwinbikers","version":"1.0","type":"link"}