{"product_id":"mercury-quicksilver-valve-spring-kit-8m0120862","title":"Mercury – Valve Spring Kit | 357 CT Iron Heads | Precision Steel Components | 8M0120862","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Valve Spring Kit | 357 CT Iron Heads | Precision Steel Components | 8M0120862\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAnyone who’s spent time around a circle track engine knows there’s a rhythm to performance—an even, confident pulse that tells you the valvetrain is working exactly as it should. When that rhythm slips, even just a little, you feel it right away. That’s why replacing worn components with trusted parts matters so much. The Quicksilver 8M0120862 Valve Spring Kit brings back that steady, responsive feel that makes the 357 CT crate engine such a favorite among racers who want dependable power without breaking from factory-sealed rules.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere’s a comfort in knowing the parts under your valve covers are built to the same exacting standards as the ones your engine rolled out with. This kit restores that confidence, helping your engine breathe cleanly, rev freely, and hold its composure lap after lap.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned specifically for the Quicksilver 357 CT circle track crate engine\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReplaces original valvetrain components to maintain sealed-engine compliance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt for use with beehive valve springs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePrecision-machined for strength, stability, and consistent valve control\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHelps preserve factory performance characteristics and reliability\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIntended for Quicksilver 357 CT crate engines equipped with iron cylinder heads\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eS\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003euitable for circle track race applications where sealed-spec compliance is required\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits engines using beehive-style valve springs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for competitive racers, engine builders, or performance shops maintaining sealed engines\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e healthy set of valve springs does more than hold everything in time—it keeps your engine feeling tight, lively, and willing to rev when you lean into the throttle. With worn springs, you’ll notice hesitation, valve float, or a lazy top end that takes the excitement out of running hard laps. This kit restores the crisp, predictable response that makes the 357 CT such a pleasure to race.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePr\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eecision manufacturing ensures every spring matches Mercury’s strict specs for seating pressure and durability. That consistency matters, especially when the goal is to keep a sealed engine performing exactly as intended. You’ll feel the difference in smoother mid-range pull, more stable high-rpm operation, and a valvetrain that stays quiet, controlled, and trustworthy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIn\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estallation is straightforward for anyone familiar with valvetrain service, and once everything is buttoned back up, the engine settles into a steady idle and pulls cleanly through the rev range—just the way a crate motor should.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eGenuine Mercury Marine part designed to match original factory specs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eGuarantees sealed-engine legality for sanctioned circle track events\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eOff\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eers longer life and more consistent performance than many aftermarket alternatives\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eProvides the correct pressure profile for beehive valve spring setups\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHelps protect engine reliability, ensuring every lap counts\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you’re racing a sealed engine, cutting corners isn’t an option. OEM parts keep you compliant, competitive, and confident.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does this valve spring kit fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e’s made specifically for the Quicksilver 357 CT crate engine with iron heads and beehive springs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes it better than aftermarket parts?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM components match exact factory calibration, keeping your sealed engine legal and consistent.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How can I confirm this is the right replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e If you’re running a 357 CT engine and maintaining sealed compliance, this is the correct kit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Is it suitable for both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e While primarily used in racing applications, the materials are engineered for durability in any environment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes—anyone experienced with valvetrain service can install it with standard tools.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935248240931,"sku":"8M0120862","price":862.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0120862.jpg?v=1761590123","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-quicksilver-valve-spring-kit-8m0120862","provider":"PartsVu","version":"1.0","type":"link"}