{"product_id":"wiseco-acura-k20-k24-flat-top-1-181x86-5mm-piston-shelf-stock-kit-k631m865","title":"Wiseco Acura K20 K24 FLAT TOP 1.181X86.5MM Piston Shelf Stock Kit - K631M865","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWiseco Forged Piston Set — Honda K20\/K24 86.5mm Flat Top (K631M865)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eA 2618 forged flat-top set at 86.5mm — a half-millimeter over stock, so this is the right choice when the block needs boring anyway. Forged from 2618 aerospace alloy for tensile strength and resilience under extreme RPM and high-stress conditions, and machined in the USA.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eCrown thickness and ring lands are designed for power-adders — turbos, blowers, nitrous. That's the distinction that matters on a boosted K: the top land and crown are where a piston fails under detonation, and this set is built with that in mind rather than adapted from an NA design.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eArmorGlide skirt coating comes standard, reducing friction, resisting seizure, and quieting the engine on cold start. Strutted forging adds strength through the pin boss area.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eSpecs:\u003c\/strong\u003e 86.5mm bore (3.405\"), 30.00mm compression height (1.181\"), flat top with valve reliefs, -3.4cc volume, 22mm floating wrist pin. Sized for 86mm stroke with a 139mm rod. Roughly 9.6:1 in a stock-deck K20.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eComplete ring set included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Honda\/Acura K20A, K20A2, K20Z, and K24 blocks running a K20 head. 02-06 RSX Type-S, Civic Si, and K-swap builds.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eVerify your compression before ordering.\u003c\/strong\u003e The ratio depends on head gasket thickness, chamber volume, and deck height — head work moves the number. And this is a 0.5mm overbore, so the block needs machining to suit.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eSet of 4 pistons with pins, locks, and rings.\u003c\/p\u003e","brand":"Street Strip Supply","offers":[{"title":"Default Title","offer_id":47228755017901,"sku":null,"price":630.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0779\/8105\/7197\/files\/K631M865.jpg?v=1786812678","url":"https:\/\/streetstripsupply.com\/products\/wiseco-acura-k20-k24-flat-top-1-181x86-5mm-piston-shelf-stock-kit-k631m865","provider":"Street Strip Supply","version":"1.0","type":"link"}