{"product_id":"cp-piston-ring-set-for-acura-honda-k20a-a2-a3-bore-87-5mm-size-1-5mm-compression-ratio","title":"CP Piston \u0026 Ring Set for Acura\/Honda K20A\/A2\/A3 - Bore (87.5mm) - Size (+1.5mm) - Compression Ratio","description":"\u003cp class=\"p1\"\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e: SC70458-4\u003c\/p\u003e\n\u003ch4 class=\"p1\"\u003e\u003cb\u003eCP Forged Piston and Ring Kit for Honda K20A\/A2\/A3 Engines – 87.5mm Bore, +1.5mm Oversize, 9.7:1 Compression Ratio\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p1\"\u003eHonda K20A, K20A2, or K20A3 engine piston and ring kit, crafted specifically for high-revving K-series performance. This forged aluminum set stands out in boosted applications, whether turbocharged, supercharged, or running nitrous by handling extreme pressures while maintaining tight tolerances for efficient combustion and reduced blow-by. Compared to factory pistons, the SC70458-4 kit provides greater resistance to detonation and thermal expansion, allowing safer tuning for higher boost levels and delivering more consistent horsepower across the RPM range. For K20 enthusiasts chasing reliable daily-driven power or track-ready response, this kit integrates seamlessly into stroker or high-compression setups, making it the direct path to a stronger, more responsive engine without the guesswork of mismatched components.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eKey Specifications\u003c\/b\u003e\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eBore Diameter\u003c\/b\u003e: 87.5mm (3.445 inches) +1.5mm oversize for precise cylinder wall clearance\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCompression Ratio\u003c\/b\u003e: 9.7:1 Balanced for naturally aspirated or forced-induction use with stock or ported K20 heads\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eStroke Compatibility\u003c\/b\u003e: 86mm\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eRod Length\u003c\/b\u003e: 139mm\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePiston Style\u003c\/b\u003e: Flat-top with four deep valve reliefs (accommodates +1mm oversized valves and high-lift cams)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePiston Material\u003c\/b\u003e: 2618-T6 high-strength forged aluminum with X-forging design for enhanced durability and lighter weight\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCompression Height\u003c\/b\u003e: 1.181 inches\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePiston Head Volume\u003c\/b\u003e: +3.30cc\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eWrist Pin Diameter\u003c\/b\u003e: 22mm (0.866 inches) – Press-fit or floating style\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePiston Weight\u003c\/b\u003e: 338 grams each (balanced to ±1 gram for smooth rotation)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eRing Specifications\u003c\/b\u003e:\u003c\/li\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eTop Ring: 1.0mm thickness, steel construction for low friction\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eSecond Ring: 1.2mm thickness, cast iron for reliable sealing\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eOil Ring: 2.8mm thickness, three-piece design with double pin oilers for superior lubrication\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eAdditional Features\u003c\/b\u003e: Accumulator grooves to control ring flutter, custom skirt and barrel shaping for reduced friction, pick-lock grooves for simple circlip installation, and optional gas ports or coatings available upon request\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThis kit weighs approximately 1.35 kg total (pistons only), keeping your rotating assembly light for quicker revs and better throttle feel.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eVehicle Fitment\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe SC70458-4 kit fits 2.0L K20-series engines in these models, ensuring bolt-on compatibility with stock or aftermarket rods and cranks:\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eAcura RSX (DC5)\u003c\/b\u003e: 2002-2004 Base (K20A3), 2002-2006 Type-S (K20A2)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHonda Civic Si (EP3)\u003c\/b\u003e: 2002-2005 (K20A3)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHonda Civic Type R (EP3, JDM)\u003c\/b\u003e: 2001-2005 (K20A)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHonda Civic Si (FA5\/FG2)\u003c\/b\u003e: 2006-2011 (K20Z1)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHonda Civic Mugen Si\u003c\/b\u003e: 2008 (K20Z3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eVerify your engine code (K20A, K20A2, K20A3, K20Z1, or K20Z3) for exact match ideal for RSX Type-S swaps into Civics or refreshed JDM Type R motors.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eWhat's Included in Your Purchase\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eEvery SC70458-4 kit arrives complete and ready for installation, with no extras needed beyond basic tools:\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003e4 x Forged Pistons\u003c\/b\u003e: Pre-machined to 87.5mm bore, flat-top design with valve reliefs and anti-detonation grooves\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003e4 x Complete Ring Sets\u003c\/b\u003e: Premium file-to-fit rings (top: 1.0mm steel, second: 1.2mm cast iron, oil: 2.8mm) for each piston\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003e4 x Chrome-Moly Wrist Pins\u003c\/b\u003e: 22mm diameter, heat-treated for strength\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003e8 x Wrist Pin Circlips\u003c\/b\u003e: Heavy-duty locks (two per pin) for secure retention\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePart Number Engraving\u003c\/b\u003e: SC70458-4 laser-etched on each piston for easy identification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eNo additional hardware required file rings to spec during assembly for optimal gap. Backed by CP's reputation for precision, this set ensures your K20 runs cooler, seals tighter, and pushes harder than ever.\u003c\/p\u003e","brand":"CP Pistons","offers":[{"title":"Default Title","offer_id":43710391582799,"sku":"CPPSC70458-4","price":766.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/SKU_SC70458-4.jpg?v=1761143315","url":"https:\/\/www.blackopsautoworks.com\/products\/cp-piston-ring-set-for-acura-honda-k20a-a2-a3-bore-87-5mm-size-1-5mm-compression-ratio","provider":"Black Ops Auto Works","version":"1.0","type":"link"}