[bigsnookmaster]

I would re-check the lash. If you have aluminum heads the lash will grow by about .006 after the engine gets hot. Or a rocker might have came out of adjustment.You might want to check the lifters to see that all the rollers are still good. I have a 406 roller w/alum heads and Jesel shaft rockers and have had no valve lash changes with 1500 miles so far. Good luck!