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Thanks for visiting the SD Performance TECH INFO. Send us a note and let us know what would be helpful. We would be happy to hear from you. What You Should Know About CNC Head Porting June 2, 2008 5 Axis CNC head porting has been around for about 25 years now but up until the last 5-10 years it was more >> Which head package is right for me? February 6, 2008 This is a question we get asked daily, while the answer can be different for everyone we thought we'd more >> Setting Valve Lash or Lifter Preload for Hyd. Cams August 21, 2007 There are a number of different methods to setting/adjusting your rockers, I prefer the exhaust open more >>