{"product_id":"manley-performance-600in-lift-single-nextek-high-perf-valve-springs-set-of-16-221428-16","title":"Manley Performance .600in Lift Single NexTek High Perf Valve Springs - Set of 16 (221428-16)","description":"\u003ch2 style=\"font-size:1.2rem;\"\u003eManley Performance .600in Lift Single NexTek High Perf Valve Springs - Set of 16 (221428-16)\u003c\/h2\u003e\u003cp\u003eThis Manley Performance valve springs (part number 221428-16) is a performance upgrade for the 1987–1990 Chevrolet Camaro Iroc-Z and 7 more listed vehicles.\u003c\/p\u003e\u003ch2\u003eVehicle fitment\u003c\/h2\u003e\u003ch3\u003eManufacturer's vehicle list\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1987–1990 Chevrolet Camaro Iroc-Z\u003c\/li\u003e\n\u003cli\u003e1988 Chevrolet Corvette 35th Anniversary Edition\u003c\/li\u003e\n\u003cli\u003e1986 Chevrolet Corvette Indianapolis 500 Pace Car\u003c\/li\u003e\n\u003cli\u003e1990–1992 Chevrolet Corvette ZR-1\u003c\/li\u003e\n\u003cli\u003e1987–1988 Pontiac Firebird Base\u003c\/li\u003e\n\u003cli\u003e1987–1992 Pontiac Firebird Trans Am\u003c\/li\u003e\n\u003cli\u003e1989–1992 Pontiac Firebird Trans Am GTA\u003c\/li\u003e\n\u003cli\u003e2004 Pontiac GTO Base\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEngine, trim, drivetrain and options can change which part fits, so \u003ca href=\"\/pages\/contact-us\"\u003econtact mobileiGo\u003c\/a\u003e with your VIN if you are unsure.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eManley Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer part number\u003c\/th\u003e\n\u003ctd\u003e221428-16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003ctd\u003eEngine Internals \u0026amp; Assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003ePerformance upgrade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping weight\u003c\/th\u003e\n\u003ctd\u003e4.0 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eBefore you buy: engine internal part tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eForged pistons and rods handle more boost and rpm than cast parts but need correct clearances set by an experienced engine builder.\u003c\/li\u003e\n\u003cli\u003eCheck bore size, stroke and compression ratio against your build plan before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWill the Manley Performance 221428-16 fit my vehicle?\u003c\/h3\u003e\u003cp\u003eIt is listed for the 1987–1990 Chevrolet Camaro Iroc-Z and 7 more listed vehicles. Check your engine, trim and options against the fitment table above before ordering.\u003c\/p\u003e\u003ch3\u003eWhat is the part number?\u003c\/h3\u003e\u003cp\u003eThe manufacturer part number is 221428-16.\u003c\/p\u003e\u003ch3\u003eWhat bore size or oversize is this part for?\u003c\/h3\u003e\u003cp\u003eBore size, oversize and compression ratio are listed in the title and specifications when the maker provides them.\u003c\/p\u003e\u003ch3\u003eIs this part new?\u003c\/h3\u003e\u003cp\u003eYes. It is a new part sourced from an authorized distributor.\u003c\/p\u003e\u003ch2\u003eManufacturer description\u003c\/h2\u003e\u003cdiv class=\"tt-mfr\"\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2\u003eSBC LS-Series, LT1 \u0026amp; Early Model LT-1 \/ LT-4 \/ L-98 NexTek® Series High Performance Hydraulic Roller Valve Springs - Set of 16 by Manley Performance\u003c\/h2\u003e\n\u003cp align=\"justify\"\u003eThese Manley NexTek valve springs are better-designed valve springs using state-of-the-art machinery for purpose-built racing engines. They're manufactured from super-clean, high-tensile chrome silicon steel and are shot-peened to MIL specs for maximum fatigue life. They feature a proprietary, multi-step heat-treating that minimizes load loss and have computer-aided modeling to minimize valve bounce and valve gear separation.\u003c\/p\u003e\n\u003cp align=\"justify\"\u003eThe Manley NexTek valve springs are smaller diameter and lightweight, allowing engines to rev higher faster. They have an extended tip thickness designed to eliminate overload breakage, and their tightly controlled open-end flatness reduces valve stem side loading.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle Conical Ovate Wire\u003c\/li\u003e\n\u003cli\u003eManufactured from “super clean” Hi-Tensile Chrome Silicon steel\u003c\/li\u003e\n\u003cli\u003eTip thickness designed to eliminate overload breakage\u003c\/li\u003e\n\u003cli\u003eShot-peened to MIL spec for maximum fatigue life\u003c\/li\u003e\n\u003cli\u003eComputer-aided modeling or designs minimizes valve bounce and valve gear separation\u003c\/li\u003e\n\u003cli\u003eTightly controlled open end flatness reduces valve stem side loading\u003c\/li\u003e\n\u003cli\u003eProprietary multi-step heat treating minimizes load loss\u003c\/li\u003e\n\u003cli\u003eOptimized “Select Size Fitting” between outer and inner springs to maximize harmonic dampening and reduce heat generated during operation\u003c\/li\u003e\n\u003cli\u003eMany offerings are a damperless design which eliminates unnecessary damper weight and reduces retainer wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBenefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigher natural frequency and lower active mass provides improved valvetrain control and higher RPM potential\u003c\/li\u003e\n\u003cli\u003eDual spring design reduces friction, which generates less heat and translates into greatly reduced load loss\u003c\/li\u003e\n\u003cli\u003eExtensively tested on the Spintron, dyno and race track (including blown nitro engines) and proven highly effective\u003c\/li\u003e\n\u003cli\u003eSmaller diameter, lightweight dual design allows engine to rev higher with improved valve train control\u003c\/li\u003e\n\u003cli\u003eAccepts smaller, lighter retainers which also promotes higher revs\u003c\/li\u003e\n\u003cli\u003eUltra clean, high tensile strength chrome silicon material\u003c\/li\u003e\n\u003cli\u003eSuper Finished multi-step surface enhancement significantly improves fatigue strength\u003c\/li\u003e\n\u003cli\u003eIdeal for Boosted Applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlease Note: The image provided is generic and may not be an accurate representation of the product you will receive\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1987-1990 Chevrolet Camaro Iroc-Z\u003c\/li\u003e\n\u003cli\u003e1991-1992,1998-2002 Chevrolet Camaro Z28\u003c\/li\u003e\n\u003cli\u003e1988 Chevrolet Corvette 35th Anniversary Edition\u003c\/li\u003e\n\u003cli\u003e1985-1992,1997-2004 Chevrolet Corvette Base\u003c\/li\u003e\n\u003cli\u003e1986 Chevrolet Corvette Indianapolis 500 Pace Car\u003c\/li\u003e\n\u003cli\u003e1990-1992 Chevrolet Corvette ZR-1\u003c\/li\u003e\n\u003cli\u003e1987-1988 Pontiac Firebird Base\u003c\/li\u003e\n\u003cli\u003e1989-1992,1998-2002 Pontiac Firebird Formula\u003c\/li\u003e\n\u003cli\u003e1987-1992 Pontiac Firebird Trans Am\u003c\/li\u003e\n\u003cli\u003e1989-1992 Pontiac Firebird Trans Am GTA\u003c\/li\u003e\n\u003cli\u003e2004 Pontiac GTO Base\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's In The Box?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e16 - Valve Springs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManley products, due to their intended use, are sold without warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c!-- tt-ap-content v1 --\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":67824194715967,"sku":"MAP MAN 221428-16","price":299.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1639\/5151\/files\/manley-performance-man-221428-16-28108784271430.jpg?v=1792571114","url":"https:\/\/www.mobileigo.com\/products\/manley-performance-600in-lift-single-nextek-high-perf-valve-springs-set-of-16-221428-16","provider":"mobileiGo.com","version":"1.0","type":"link"}