{"title":"Valve Springs","description":null,"products":[{"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"},{"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"},{"product_id":"pac-1209x-16-0-680-in-id-1-324-in-od-1-800-in-installed-height-0-750-in-max-valve-lift","title":"PAC-1209X-16 0.680 in. ID – 1.324 in. OD – 1.800 in. installed Height – 0.750 in. Max Valve Lift","description":"\u003cp\u003e0.680 in. ID – 1.324 in. OD – 1.800 in. installed Height – 0.750 in. Max Valve Lift\u003c\/p\u003e\n\u003cp\u003ePAC Racing’s Street Performance 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. Applications include GM Gen III\/IV LS, Ford 2V and 4V Mod Motors, Ford Coyote, Big Block Chevy, Ford 5.4L GT500 \u0026amp; Cobra Jet, Chrysler 6.4L Gen III Hemi, GM Gen IV LS7, and Ford Godzilla 7.3L.\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\u003e1.324 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003e0.950 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Inner Valve Spring    \u003cbr\u003e0.680 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e1.800 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load \/ Height (Valve Closed)    \u003cbr\u003e160 LB @ 1.800 IN\u003c\/p\u003e\n\u003cp\u003eOpen Height    \u003cbr\u003e1.100 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e510 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e510 LB @ 1.100 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e500 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.000 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.750 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 300 Series    \u003cbr\u003eR335\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 400 Series    \u003cbr\u003eR435, R450\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 500 Series    \u003cbr\u003eR550\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 600 Series    \u003cbr\u003eR635, R650\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Seat    \u003cbr\u003eS129, S135, S136\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|Street Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723186078009,"sku":"PAC-1209X-16","price":402.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1237x_9a3a960a-f791-4f61-acc5-62faebe6c17c.png?v=1792519004"},{"product_id":"pac-1330-16-0-726-in-id-1-500-in-od-2-050-in-installed-height-0-850-in-max-valve-lift","title":"PAC-1330-16 0.726 in. ID – 1.500 in. OD – 2.050 in. installed Height – 0.850 in. Max Valve Lift","description":"\u003cp\u003e0.726 in. ID – 1.500 in. OD – 2.050 in. installed Height – 0.850 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\u003e\u003cbr\u003eOuter Diameter – Outer Valve Spring    \u003cbr\u003e1.500 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003e1.050 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Inner Valve Spring    \u003cbr\u003e0.726 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e2.050 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load    \u003cbr\u003e275 PS\u003c\/p\u003e\n\u003cp\u003eOpen Height    \u003cbr\u003e1.200 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e938 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e938 LB @ 1.200 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e780 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.130 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.850 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 400 Series    \u003cbr\u003eR408\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 500 Series    \u003cbr\u003eR508, R509, R544\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 600 Series    \u003cbr\u003eR608, R609, R644\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Seat    \u003cbr\u003eS110, S126, S134\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Cup    \u003cbr\u003eC202\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\u003eDrag Race\u003c\/p\u003e\n\u003cp\u003ePrimary Market    \u003cbr\u003eDrag Race|Street Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723197907257,"sku":"PAC-1330-16","price":604.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1237x_cff3e3fd-94c4-4873-afde-5eed52c4a011.png?v=1792519483"},{"product_id":"pac-1218x-16-top-0-650-in-bottom-0-885-in-id-top-1-055-in-bottom-1-290-in-od-1-800-in-installed-height-0-600-in-max-valve-lift","title":"PAC-1218X-16 Top 0.650 in. \/ Bottom 0.885 in. ID – Top 1.055 in. \/ Bottom 1.290 in. OD – 1.800 in. installed Height – 0.600 in. Max Valve Lift","description":"\u003cp\u003eTop 0.650 in. \/ Bottom 0.885 in. ID – Top 1.055 in. \/ Bottom 1.290 in. OD – 1.800 in. installed Height – 0.600 in. Max Valve Lift\u003c\/p\u003e\n\u003cp\u003ePAC Racing’s 1200 Series Ovate Wire Beehive Valve Springs are a budget-minded spring designed for the rigors of street driving with occasional track days in the mix. This is the perfect spring for your street\/strip terror. Applications include Ford 2V Mod Motor, GM Gen III\/IV LS, Big Block Chevy, Ford 4V Mod Motor, Ford 3V Mod Motor, Chrysler Gen III Hemi, Viper SRT-10, and Small Block Chevy.\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\u003eTop 1.055 IN \/ Bottom 1.290 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003eTop 0.650 IN \/ Bottom 0.885 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e1.800 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load    \u003cbr\u003e130 PS\u003c\/p\u003e\n\u003cp\u003eInstalled Load \/ Height (Valve Closed)    \u003cbr\u003e130 LB @ 1.800 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e318 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e318 LB @ 1.200 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e313 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.140 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.600 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 300 Series    \u003cbr\u003eR310, R311, R363\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 500 Series    \u003cbr\u003eR510, R511\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Seat    \u003cbr\u003eS111\u003c\/p\u003e\n\u003cp\u003eValve Spring Series    \u003cbr\u003eRPM Series\u003c\/p\u003e\n\u003cp\u003eValve Spring Type    \u003cbr\u003eOvate Wire Beehive\u003c\/p\u003e\n\u003cp\u003ePrimary Market    \u003cbr\u003eCircle Track|Street Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723426234681,"sku":"PAC-1218X-16","price":305.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1218x.png?v=1792520910"},{"product_id":"pac-1281x-16-valve-springs-1200-series-drag-race-beehive-single-0-551-in-maximum-valve-lift-245-lbs-in-rate-ford-5-0l-modular-v8-set-of-16","title":"PAC-1281X-16 Valve Springs, 1200 Series Drag Race, Beehive, Single, 0.551 in. Maximum Valve Lift, 245 lbs.\/in. Rate, Ford, 5.0L Modular V8, Set of 16","description":"\u003cp\u003eValve Springs, 1200 Series Drag Race, Beehive, Single, 0.551 in. Maximum Valve Lift, 245 lbs.\/in. Rate, Ford, 5.0L Modular V8, Set of 16\u003c\/p\u003e\n\u003cp\u003ePAC Racing’s Street Performance RPM Series Beehive 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.\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\u003eTop 0.849 IN \/ Bottom 1.031 IN\u003c\/p\u003e\n\u003cp\u003eInner Diameter – Outer Valve Spring    \u003cbr\u003eTop 0.527 IN \/ Bottom 0.709 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Height    \u003cbr\u003e1.811 IN\u003c\/p\u003e\n\u003cp\u003eInstalled Load    \u003cbr\u003e80 PS\u003c\/p\u003e\n\u003cp\u003eOpen Height    \u003cbr\u003e1.260 IN\u003c\/p\u003e\n\u003cp\u003eOpen Load    \u003cbr\u003e214 PS\u003c\/p\u003e\n\u003cp\u003eOpen Load \/ Height (Valve Open)    \u003cbr\u003e214 LB @ 1.260 IN\u003c\/p\u003e\n\u003cp\u003eValve Spring Rate    \u003cbr\u003e245 PS\u003c\/p\u003e\n\u003cp\u003eMax Coil Bind    \u003cbr\u003e1.208 IN\u003c\/p\u003e\n\u003cp\u003eMax Valve Lift    \u003cbr\u003e0.551 IN\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 300 Series    \u003cbr\u003eR364\u003c\/p\u003e\n\u003cp\u003eRecommended Valve Spring Retainer – 400 Series    \u003cbr\u003eR464\u003c\/p\u003e\n\u003cp\u003eValve Spring Series    \u003cbr\u003eRPM Series\u003c\/p\u003e\n\u003cp\u003eValve Spring Type    \u003cbr\u003eOvate Wire Beehive\u003c\/p\u003e\n\u003cp\u003ePrimary Market    \u003cbr\u003eStreet Performance\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723489149241,"sku":"PAC-1281X-16","price":305.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1218x_7c87aabb-98e7-49b9-abc2-fd18b9ef7de3.png?v=1792521315"},{"product_id":"pac-1575-16-1500-series-dual-valve-springs-spring-od-1-409","title":"PAC-1575-16 1500 Series Dual Valve Springs Spring OD: 1.409","description":"\u003cp\u003e1500 Series Dual Valve Springs Spring OD: 1.409\u003c\/p\u003e\n\u003cp\u003ePac 1500 series valve springs offer an industry leading nitriding process that allows for the material to withstand the abusive wear and fatigue of the typical endurance engine environment. These springs come fully prepared for racing conditions with chamfering, polishing, and the latest surface enhancement technology available. From 24 hours of Lemans to the rigors of NASCAR the 1500 series spring has the history to withstand this environment.\u003c\/p\u003e\n\u003cp\u003e1500 Series Circle Track Valve Springs\u003cbr\u003e1500 Series Dual Valve Springs\u003cbr\u003eSpring OD: 1.409\u003cbr\u003eSpring ID: 0.700\u003cbr\u003eSeat Pressure: 150 LBS @ 2.000\u003cbr\u003eOpen Pressure: 645 LBS @ 1.150\u003cbr\u003eSpring Rate: 582\u003cbr\u003eMax Coil Bind: 1.110\u003cbr\u003eMax Lift: .850\u003cbr\u003e16\/pkg\u003c\/p\u003e","brand":"PAC","offers":[{"title":"Default Title","offer_id":67723925913913,"sku":"PAC-1575-16","price":621.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0102\/9082\/3219\/files\/1371_74880788-ab9f-4cd0-b86d-2c27fe8cd3d4.png?v=1792524149"}],"url":"https:\/\/3vperformance.com\/collections\/valve-springs.oembed","provider":"3V Performance","version":"1.0","type":"link"}