Valve Springs Stock Plus (Stage 1/Standard) For a mild bump over used factory springs, we use these quality USA made valve springs as the standard spring for our popular o-ringed cylinder heads, perfect for the daily driver, tow rig, or mild performance upgrade looking for solid reliability. Used factory springs typically have around 60-70 psi at 1.865" installed height. These have 80 psi @ 1.865", we use these in all of our stock replacement cylinder heads. Street Performance Valve Springs (Stage 2) These street performance springs are ideal for trucks with moderate turbo and injector upgrades. We don't just offer a "one size fits all" valve spring, there's the right spring for the application, and "more isn't always better". These springs feature 100 psi at an installed height of 1.865". They're perfect for the street truck with a moderate sized single turbo (70mm+) capable of 50+ psi of boost, occasional track use (Large Compound Turbo and Nitrous applications should use the Stage 3 - Competition spring). Often times back pressure is 1.5-3x higher than boost pressure, especially during a hard downshift or torque converter lockup. During those times it's important to ensure the valve springs strong enough so as not to be overcome by boost. We use these in all our Street and Super Street Performance engine builds, well matched for a Stage 2 camshaft. Competition Valve Springs (Stage 3) These springs are for the competition truck or hot street application, perfect for compound turbo setups, nitrous, and anything else you can throw at them. If you need a 100 psi boost gauge, these are the springs for you. They've been proven by Charlie Keeter's (Keeters Diesel Performance) back to back Diesel Power Magazine's DPC victories and record setting (9.51@148mph, KDD engine) with repeated trips down the 1/4 mile well over 100 psi of boost/back pressure. We use these in all of our in house competition builds, well matched for a stage 3 camshaft. While these springs cover 99% of our customers needs, we also have custom springs available for the build that is off the charts. Email for more info. Add a set of KDD pushrods with your order to handle the extra spring pressure of our performance springs!
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