Those who are running super aggressive camshafts that have higher lift will require these special valve springs to provide the clearance needed. We made sure to cover all possible aspects for reliability and all conditions for any racing and street use. The item "Tomei Dual Valve Springs Type-B for Nissan S13 S14 S15 SR20 SR20DET" is in sale since Wednesday, August 5, 2015.This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Other Engines & Engine Parts". The seller is "autocat51" and is located in West Covina, California. This item can be shipped worldwide.