{"product_id":"comp-cams-valve-seal-5-16-viton-metal-body","title":"COMP Cams Metal-Body Viton Valve Seal 5\/16 x .530","description":"\u003ch4\u003ePositive Valve Sealing for Performance Engine Builds\u003c\/h4\u003e\n\u003cp\u003eCOMP Cams 520-1 is a single metal-body Viton valve stem seal sized for a 5\/16-inch valve stem and a .530-inch valve guide. Its compact .575-inch outside diameter helps preserve spring clearance while the Viton sealing element controls oil at the valve guide in compatible cylinder-head assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMetal-body positive-style seal for secure guide retention.\u003c\/li\u003e\n\u003cli\u003eViton sealing material suited to performance engine operating temperatures.\u003c\/li\u003e\n\u003cli\u003eDesigned for a 5\/16-inch valve stem and .530-inch valve-guide diameter.\u003c\/li\u003e\n\u003cli\u003e.575-inch outside diameter supports valve-spring clearance in compatible assemblies.\u003c\/li\u003e\n\u003cli\u003eSold individually for precise replacement quantities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eRequirement\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal dimensional fit\u003c\/td\u003e\n\u003ctd\u003e5\/16-inch valve stem with .530-inch outside-diameter valve guide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility check\u003c\/td\u003e\n\u003ctd\u003eVerify guide machining, retainer-to-seal clearance, spring inside diameter, and valve lift before installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer part number\u003c\/td\u003e\n\u003ctd\u003e520-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003ePositive valve stem oil seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve stem diameter\u003c\/td\u003e\n\u003ctd\u003e5\/16 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve guide diameter\u003c\/td\u003e\n\u003ctd\u003e.530 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal outside diameter\u003c\/td\u003e\n\u003ctd\u003e.575 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeal material\u003c\/td\u003e\n\u003ctd\u003eViton\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody style\u003c\/td\u003e\n\u003ctd\u003eMetal body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003eOne\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e036584151739\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOne COMP Cams metal-body Viton valve stem seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout COMP Cams\u003c\/h4\u003e\n\u003cp\u003eCOMP Cams develops valvetrain components for street and competition engines, including camshafts, valve springs, rocker arms, pushrods, and precision hardware. Its valve-seal range is organized by verified stem and guide dimensions for accurate component selection.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eNo related product is linked because valve springs, retainers, locks, and guides must be selected from verified cylinder-head dimensions rather than general similarity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the 520-1?\u003c\/strong\u003e\n\u003cp\u003eIt is one metal-body Viton positive valve stem seal for a 5\/16-inch valve stem and a .530-inch valve guide.\u003c\/p\u003e\n\u003cstrong\u003eIs this seal sold individually?\u003c\/strong\u003e\n\u003cp\u003eYes. The package quantity is one seal, so order the quantity required for the number of valves being serviced.\u003c\/p\u003e\n\u003cstrong\u003eWhat valve stem size does it fit?\u003c\/strong\u003e\n\u003cp\u003eIt is designed for a 5\/16-inch valve stem.\u003c\/p\u003e\n\u003cstrong\u003eWhat valve guide size is required?\u003c\/strong\u003e\n\u003cp\u003eThe seal is designed to install on a .530-inch outside-diameter guide.\u003c\/p\u003e\n\u003cstrong\u003eWhat is the seal's outside diameter?\u003c\/strong\u003e\n\u003cp\u003eThe metal body measures .575 inch outside diameter.\u003c\/p\u003e\n\u003cstrong\u003eIs this a universal vehicle fitment?\u003c\/strong\u003e\n\u003cp\u003eIt is universal only by verified dimensions. Compatibility depends on the cylinder head, guide machining, valve stem, retainer, spring, and available lift clearance.\u003c\/p\u003e\n\u003cstrong\u003eCan it be installed on an unmachined guide?\u003c\/strong\u003e\n\u003cp\u003eInstallation requires the guide diameter and finish specified for this positive-style seal. The cylinder head should be measured and machined by a qualified engine builder when needed.\u003c\/p\u003e\n\u003cstrong\u003eShould clearance be checked after installation?\u003c\/strong\u003e\n\u003cp\u003eYes. Verify retainer-to-seal clearance at maximum valve lift and confirm the spring does not contact the seal body.\u003c\/p\u003e\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eMeasure the valve stem, valve-guide outside diameter, spring inside diameter, and available retainer-to-seal clearance.\u003c\/li\u003e\n\u003cli\u003eClean the valve guide and inspect the stem and guide for wear before assembly.\u003c\/li\u003e\n\u003cli\u003eLubricate the seal lip and protect it from sharp valve-stem grooves during installation.\u003c\/li\u003e\n\u003cli\u003ePress the seal squarely onto the prepared .530-inch guide using the correct seal installer.\u003c\/li\u003e\n\u003cli\u003eVerify that the seal is fully seated and undamaged.\u003c\/li\u003e\n\u003cli\u003eCheck retainer-to-seal and spring-to-seal clearance through the full valve-lift range before final assembly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eCalifornia Proposition 65 Warning:\u003c\/strong\u003e This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.\u003c\/p\u003e","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":67831997628495,"sku":"CCA520-1","price":2.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/comp-cams-520-1-product-1.webp?v=1792682189","url":"https:\/\/www.blackopsautoworks.com\/products\/comp-cams-valve-seal-5-16-viton-metal-body","provider":"Black Ops Auto Works","version":"1.0","type":"link"}