I currently run a stock cam core, .868 gross lift, .510 lobe lift, stainless valves, 7500 rpm max. Flex when checking lash showed an increase of . 005 to . 006 in lash around the base circle from flex and compression. I would love to see a spintron video of what is going on at 7500 rpm! A move to a bigger cam core, higher rocker ratios and Ti valves is all in the interest of a better race valvetrain.