{"product_id":"sealed-powercast-piston-15","title":"Sealed Power H661CP40 Hypereutectic Piston Set — Fits Big Block Chevy 4.290 Bore","description":"\u003cdiv style=\"background:#f7f7f7;border-left:4px solid #c00000;padding:14px 18px;margin:0 0 18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;font-size:1.1em;\"\u003eAbout Sealed Power\u003c\/h3\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.55;\"\u003eSealed Power engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Sealed Power lineup with fast shipping and expert fitment support — order with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eReliable Hypereutectic Pistons for Big Block Chevy\u003c\/h2\u003e\u003cp\u003eThe Sealed Power H661CP40 piston set is engineered for enthusiasts who demand consistency and durability in their Big Block Chevy engines. Featuring a 4.290-inch bore, these hypereutectic pistons are built to withstand higher combustion pressures than standard cast alternatives. The specialized skirt coating minimizes friction, promoting smoother operation and extended engine life. Whether you are restoring a classic muscle car or building a reliable street engine, these pistons provide the stability and performance you need.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 4.290 inches for oversized cylinder applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Hypereutectic aluminum alloy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Grooves:\u003c\/strong\u003e 5\/64 x 5\/64 x 3\/16 inch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression:\u003c\/strong\u003e Minus 2.00 cc dish volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Coated skirt to reduce cylinder wall wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet Includes:\u003c\/strong\u003e 8 matching pistons.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChoosing the right piston is critical for engine longevity. Sealed Power is a trusted name in automotive engineering, and the H661CP40 series is no exception. These pistons offer excellent thermal management, which is vital for preventing ring land failure and maintaining optimal compression ratios. By utilizing a slightly larger bore, you can clean up worn cylinder walls and restore your engine's power output to like-new condition. For top-tier engine components and expert advice, look no further than GGCRACING.\u003c\/p\u003e\n\u003cdiv style=\"margin:24px 0;border-top:1px solid #eee;padding-top:18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOften bought with\u003c\/h3\u003e\n\u003cp style=\"font-size:0.9em;color:#555;margin:0 0 8px;\"\u003eOther popular Sealed Power products customers consider together:\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/speed-pro-performance-2015-x3009-r1006\" style=\"color:#0066cc;text-decoration:none;\"\u003eSealed Power Speed Pro Performance Street Catalog – 2015 Edition\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/cam-bearing-set-36\" style=\"color:#0066cc;text-decoration:none;\"\u003eSealed Power Cam Bearing Set Standard Journal — Fits Small Block Chevy V8\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/main-bearing-spacer-set\" style=\"color:#0066cc;text-decoration:none;\"\u003eSealed Power Main Bearing Spacer Set Standard — Fits 351C Crank in SBF\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/rod-bearing-171\" style=\"color:#0066cc;text-decoration:none;\"\u003eSealed Power 1555CPA10 Connecting Rod Bearing - 0.010 in Undersize - Pontiac V8\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/rod-bearing-172\" style=\"color:#0066cc;text-decoration:none;\"\u003eSealed Power Rod Bearing 0.020 Undersize — Fits Pontiac V8 Engines\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"Sealed Power H661CP40 Hypereutectic Piston Set \\u2014 Fits Big Block Chevy 4.290 Bore\",\"description\":\"Get the Sealed Power H661CP40 hypereutectic piston set for your 4.290 bore Big Block Chevy. 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Contact our experts at GGCRACING with your VIN and we'll verify before you order.\"}},{\"@type\":\"Question\",\"name\":\"How long is shipping for Sealed Power?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.\"}},{\"@type\":\"Question\",\"name\":\"How do I install the Sealed Power H661CP40 Hypereutectic Piston Set \\u2014 Fits Big Block Chevy 4.290 Bore?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most plug-and-play LED upgrades take 15-30 minutes per side. Full retrofits or harness installs may require additional wiring.\"}}]}\u003c\/script\u003e","brand":"Sealed Power","offers":[{"title":"Default Title","offer_id":41068392644692,"sku":"BDBR_H661CP40","price":221.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/3210\/2484\/files\/SEAH661CP40.jpg?v=1716770329","url":"https:\/\/ggcracing.com\/products\/sealed-powercast-piston-15","provider":"GGCRACING INC","version":"1.0","type":"link"}