{"product_id":"nissan-rb25-rb26-extreme-2-8l-en40b-stroker-kit","title":"Spool RB25 - 2.8L Extreme Stroker Kit with Custom CP Pistons","description":"\u003ch2\u003eSpool Nissan RB25 \/ RB26 \u003cstrong\u003eExtreme 2.8L Stroker Kit\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe Spool Extreme 2.8 Litre stroker kit for Nissan RB25 and RB26 engines is engineered for \u003cstrong\u003eserious high-power applications\u003c\/strong\u003e where strength, durability, and torque delivery are critical.\u003c\/p\u003e\n\u003cp\u003eAt the core of this kit is the \u003cstrong\u003eSpool EN40B billet RB28 stroker crankshaft\u003c\/strong\u003e, combined with \u003cstrong\u003eDrag Pro forged connecting rods\u003c\/strong\u003e and \u003cstrong\u003eCP-Carrillo custom pistons\u003c\/strong\u003e, creating an uncompromising bottom-end solution for extreme boost and high RPM use.\u003c\/p\u003e\n\n\u003ch2\u003eKit Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpool EN40B Billet RB28 Stroker Crankshaft\u003c\/strong\u003e\u003cbr\u003e77.7 mm stroke\u003cbr\u003eTrue billet construction, CNC-machined from EN40B core stock\u003cbr\u003ePrecision nitrided, final ground, and fully balanced\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpool Drag Pro I-Beam Forged Connecting Rods\u003c\/strong\u003e\u003cbr\u003eSupplied with \u003cstrong\u003eARP L19 bolts\u003c\/strong\u003e as standard\u003cbr\u003e\u003cem\u003eDowngrade option available:\u003c\/em\u003e ARP 2000 bolts or H-Beam Conrods with different bolt options.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCP-Carrillo Custom Pistons\u003c\/strong\u003e\u003cbr\u003eCustom manufactured to suit RB25 and RB26 applications\u003cbr\u003eAvailable in multiple bore sizes and compression ratios\u003cbr\u003eSupplied complete with \u003cstrong\u003erings, pins, and locks\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003eLead time:\u003c\/em\u003e approximately \u003cstrong\u003e5–8 weeks\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e300M Tool Steel Gudgeon Pins\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e0.250\" diameter supplied as standard\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003eDowngrade options available\u003c\/em\u003e for lower power applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cp\u003eIncreasing stroke to \u003cstrong\u003e77.7 mm\u003c\/strong\u003e raises displacement to approximately \u003cstrong\u003e2.8 litres\u003c\/strong\u003e, delivering significant gains across the usable RPM range:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eMajor improvements in \u003cstrong\u003elow and mid-range torque\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEarlier turbo spool\u003c\/strong\u003e and improved throttle response\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIncreased \u003cstrong\u003epeak power capability\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned to handle \u003cstrong\u003eextreme cylinder pressure and RPM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis combination is ideally suited to large-frame turbochargers, drag racing, roll racing, and high-end street builds where reliability at extreme power levels is non-negotiable.\u003c\/p\u003e\n\n\u003ch2\u003eDesigned for Extreme RB Builds\u003c\/h2\u003e\n\u003cp\u003eEvery component in the Extreme 2.8L stroker kit has been selected to support:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHigh boost pressure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAggressive tuning strategies\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSustained high RPM operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLong-term durability under extreme load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is a \u003cstrong\u003eno-compromise RB bottom-end package\u003c\/strong\u003e, built for customers who want maximum strength with flexibility to tailor components based on power goals.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Fitment Note\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Depending on block casting and assembly tolerances, minor \u003cstrong\u003econrod-to-block clearancing\u003c\/strong\u003e may be required during installation.\u003c\/p\u003e\n\n\u003ch2\u003eEN40B vs 4340 – Crankshaft Material Comparison\u003c\/h2\u003e\n\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eEN40B Billet Steel\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e4340 Billet Steel\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Use\u003c\/td\u003e\n\u003ctd\u003eMotorsport \/ High-End Performance\u003c\/td\u003e\n\u003ctd\u003ePerformance Automotive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlloy Type\u003c\/td\u003e\n\u003ctd\u003eNickel-Chromium-Molybdenum Steel\u003c\/td\u003e\n\u003ctd\u003eNickel-Chromium-Molybdenum Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Strength\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFatigue Resistance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExceptional\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTorsional Strength\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVery High\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNitriding Response\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOutstanding\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Hardness (Post-Nitriding)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVery High\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh RPM Stability\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistance to Micro-Cracking\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSuperior\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitability for Extreme Cylinder Pressure\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePreferred\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSuitable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Power Range\u003c\/td\u003e\n\u003ctd\u003e2,000+ hp applications\u003c\/td\u003e\n\u003ctd\u003eUp to ~1,500 hp (application dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003eHigher\u003c\/td\u003e\n\u003ctd\u003eLower\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\n\u003cp\u003e\u003cstrong\u003eSummary:\u003c\/strong\u003e\u003cbr\u003e4340 billet steel remains an excellent choice for many high-performance RB25 and RB26 builds.\u003cbr\u003e\u003cstrong\u003eEN40B is a premium upgrade\u003c\/strong\u003e, selected for engines operating at extreme power levels, high boost, and sustained high RPM where fatigue resistance and long-term reliability are critical.\u003c\/p\u003e\u003ch2\u003eAvailable options\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePiston Diameter: +0.5mm; +1mm; STD (Special Order)\u003c\/li\u003e\n\u003cli\u003ePin Upgrade: 300M .250\"; 9310 .250\"; No Upgrade\u003c\/li\u003e\n\u003cli\u003eConrod Option: Spool Drag Pro I-Beam ARP L19 7\/16 Bolt; Spool Drag Pro I-Beam ARP2000 7\/16 Bolt; Spool H-Beam ARP CA625 3\/8 Bolt; Spool H-Beam ARP L19 3\/8 Bolt; Spool H-Beam ARP2000 3\/8 Bolt\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine build fitment\u003c\/h2\u003e\u003cp\u003eRB25. Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.\u003c\/p\u003e\u003ch2\u003eInstallation and BBT workshop support\u003c\/h2\u003e\u003cp\u003eConfirm block and head configuration, finished bore size, bearing clearances, compression ratio and crank trigger compatibility. Block clearancing and rotating assembly balancing may be required.\u003c\/p\u003e\u003cp\u003eBuilt by Boost \u0026amp; Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.\u003c\/p\u003e","brand":"Spool","offers":[{"title":"+0.5mm \/ No Upgrade \/ Spool H-Beam ARP2000 3\/8 Bolt","offer_id":67602699190339,"sku":"BBT-SP-46C2514285A64DA3","price":9495.0,"currency_code":"AUD","in_stock":true},{"title":"+1mm \/ No Upgrade \/ Spool H-Beam ARP2000 3\/8 Bolt","offer_id":67602699223107,"sku":"BBT-SP-EAFA331F48F0F0C9","price":9495.0,"currency_code":"AUD","in_stock":true},{"title":"STD (Special Order) \/ No Upgrade \/ Spool H-Beam ARP2000 3\/8 Bolt","offer_id":67602699255875,"sku":"BBT-SP-5FA70360968AEED6","price":9495.0,"currency_code":"AUD","in_stock":true},{"title":"+0.5mm \/ No Upgrade \/ Spool Drag Pro I-Beam ARP2000 7\/16 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