{"product_id":"pac-1237x-16-0-630-in-id-1-274-in-od-1-800-in-installed-height-0-700-in-max-valve-lift","title":"PAC-1237X-16 0.630 in. ID – 1.274 in. OD – 1.800 in. installed Height – 0.700 in. Max Valve Lift","description":"\u003cp\u003e\u003cspan\u003e0.630 in. ID – 1.274 in. OD – 1.800 in. installed Height – 0.700 in. Max Valve Lift\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003ePAC Racing’s RPM Series Dual Valve Springs are constructed using our signature PACaloy super clean wire and are heat-treated in-house for precision spring rates and improved strength. They also receive a multi-peen process, polishing, and a Nano-Peen™ proprietary surface treatment for service life optimization. These springs fit GM Gen III\/IV LS engines with specific part numbers for stock heads and aftermarket heads.\u003c\/p\u003e\n\u003cp\u003eBuilt using our signature PACaloy super clean wire to ensure strength and durability\u003cbr\u003eIn-house heat-treating for precise spring rates and increased strength\u003cbr\u003eMulti-peen process to optimize service life\u003cbr\u003ePolishing to improve operating cycles\u003cbr\u003eNano-Peen™ proprietary surface treatment\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eOuter Diameter – Outer Valve Spring    \u003cbr\u003e1.274 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003e0.900 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Inner Valve Spring    \u003cbr\u003e0.630 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e1.800 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load \/ Height (Valve Closed)    \u003cbr\u003e200 LB @ 1.800 IN\u003c\/p\u003e\n\u003cp\u003eOpen Height    \u003cbr\u003e1.100 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e585 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e585 LB @ 1.100 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e550 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.045 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.700 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 400 Series    \u003cbr\u003eR432\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 500 Series    \u003cbr\u003eR532\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 600 Series    \u003cbr\u003eR632\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Seat    \u003cbr\u003eS128, S138\u003c\/p\u003e\n\u003cp\u003eValve Spring Series    \u003cbr\u003eRPM Series\u003c\/p\u003e\n\u003cp\u003eValve Spring Type    \u003cbr\u003eDual\u003c\/p\u003e\n\u003cp\u003ePrimary Market    \u003cbr\u003eCircle Track Drag Race Street Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723141251385,"sku":"PAC-1237X-16","price":503.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1237x.png?v=1792517300","url":"https:\/\/3vperformance.com\/products\/pac-1237x-16-0-630-in-id-1-274-in-od-1-800-in-installed-height-0-700-in-max-valve-lift","provider":"3V Performance","version":"1.0","type":"link"}