Paul Don't give up With all the research you have been doing, you know the valve lift needs to be less than .500" What you don't know is the effective rocker ratio with the nailhead rockers. Put the stock cam in the block, put a set of light springs on the intake and exhaust valves for just cylinder #1 and put the head on the block with just a couple of bolts. Install the rocker arm assembly with lifters and pushrods for cylinder #1 only. Put a dial indicator on the lifter and the valve retainer. Then turn the cam and chart the valve lift for every .100" increment of lobe lift. You will need to go further than the stock cam lift, so put feeler gauges between the top of the cam lobe and the lifter to get near .500 valve lift. You will be able to see if the rocker ratio is linear and you can post all the numbers as a reference for all other board members to see. Once you know the lobe lift required to give you a .450 to .475 valve lift, then you can simply call up TA and ask for a 215/215, lobe lift xxx on a 113 lobe center and they will grind you a cam. Mark will also get you a cam. Paul BTW we used Comp once for a turbo cam and they over spec'd the duration for our application. The cam they specified for you is comparable to a blower grind http://schneidercams.com/284Hnailheadhydraulic.aspx
