{"product_id":"pac-1371-16-0-716-in-id-1-374-in-od-1-950-in-installed-height-0-700-in-max-valve-lift","title":"PAC-1371-16 0.716 in. ID – 1.374 in. OD – 1.950 in. installed Height – 0.700 in. Max Valve Lift","description":"\u003cp\u003e0.716 in. ID – 1.374 in. OD – 1.950 in. installed Height – 0.700 in. Max Valve Lift\u003c\/p\u003e\n\u003cp\u003ePAC Racing’s 1300 Series Drag Race Dual Valve Spring is the manifestation of the latest technology in the drag racing valvetrain aftermarket. Traditional springs were made with higher loads and rates without concern of spring mass and frequency. PAC Racing has taken years of research and coupled that with exotic new heat treatment methods to produce the next generation of drag racing valve springs. The 1300 Series springs feature a 15-30% reduction in physical mass. This, coupled with a natural frequency increase of 20%, enables your engine to rev higher, faster, and last longer even with aggressive camshaft profiles. These springs are constructed of our signature PACaloy super clean wire and are heat-treated in-house for precise spring rates and enhanced strength. They undergo a multi-peen process to optimize service life as well. Unique to the 1300 Series, these springs then receive ID\/OD chamfer finishing, a run through the polisher, and a Nano-Peen™ proprietary surface treatment to improve operating cycles.\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\u003eID\/OD chamfer finishing\u003cbr\u003ePolishing to improve operating cycles\u003cbr\u003eNano-Peen™ Proprietary Surface Treatment\u003c\/p\u003e\n\u003cp\u003eOuter Diameter – Outer Valve Spring    \u003cbr\u003e1.374 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003e1.000 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Inner Valve Spring    \u003cbr\u003e0.716 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e1.950 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load    \u003cbr\u003e150 PS\u003c\/p\u003e\n\u003cp\u003eOpen Height    \u003cbr\u003e1.250 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e455 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e455 LB @ 1.250 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e436 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.190 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.700 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 300 Series    \u003cbr\u003eR317, R348\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 500 Series    \u003cbr\u003eR517, R552\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Seat    \u003cbr\u003eS114, S115\u003c\/p\u003e\n\u003cp\u003eValve Spring Series    \u003cbr\u003e1300 Series\u003c\/p\u003e\n\u003cp\u003eValve Spring Type    \u003cbr\u003eDual\u003c\/p\u003e\n\u003cp\u003eValve Spring Application    \u003cbr\u003eCircle Track\u003c\/p\u003e\n\u003cp\u003ePrimary Market    \u003cbr\u003eCircle Track|Street Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723132174649,"sku":"PAC-1371-16","price":385.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1371.png?v=1792516885","url":"https:\/\/3vperformance.com\/products\/pac-1371-16-0-716-in-id-1-374-in-od-1-950-in-installed-height-0-700-in-max-valve-lift","provider":"3V Performance","version":"1.0","type":"link"}