Thanks for all the info! ( one of the reasons i love my AEM's and Apexi managment systems on the turbo cars I build )

I just phoned most of the guys in this town, non of them know of anyone with the equipment to properly curve a dissy so I will order in the MSD spring kit and fit some slightly softer springs to get it all in a touch earlier than the 4300-4500 stock, though honestly im not worried about the power under 5000rpm, the midrange is fantastic already, but will check tonight where my total advance is (neibours will love me making all that noise)

I am leaning towards a spring pressure / valve clearance as the route cause of drama by how repeatable it is. going to try it at .4mm clearance and from there look at seat pressure if it clears up a few houndred RPM. One thing I did pick up is that Tomei say you should use the Nismo retainer for anything over 7mm lift @ cam, I wonder if their double valve springs were not design for the nismo retainer only which I would imagine drop the outer edge of the retainer down to give it rocker clearance, and in dropping it also give it more seat pressure? just a thought,,,, kicking my own ass for not checking like I do on the turbo cars

p.s. to the guy who said MSD coil & pertronix, it did the identical thing on the stock coil b4 I upgraded.