Isky Endurance Plus Valve Springs Part # 8005PLUS Specs. Outer OD/ID: 1.530/1.110. The Endurance Plus series of valve springs from Isky Racing Cams utilizes a specially processed Tool Room Material outer spring for increased endurance/reliability. Endurance Plus springs are designed for late models, modifieds, etc. And are Spintron Test-Proven up to 8400 rpm for 850 racing miles.The item "Isky 8005PLUS Endurance Plus Valve Springs Dual with Damper. 650 Max Lift Solid" is in sale since Friday, January 26, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Valves & Parts". The seller is "fap_engineparts" and is located in Ontario, New York. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Bahamas, Viet nam, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Turks and caicos islands, Barbados, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Gibraltar, Guadeloupe, Iceland, Jordan, Cambodia, Cayman islands, Sri lanka, Luxembourg, Macao, Martinique, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Uruguay.