A friend of mine had a lot of problems with that set up on stage 6 heads. I had the same problems on a set of B1's with the single shaft system. The problem was really spring size. The T&D with the common shaft deal, needs to have perfect geometry, perfect pushrod length, and can only be adjusted down 1-1 3/4 turns, with adjuster backed all the way to the top of the rocker. Also, the rockers are only suited to use a 1.55 valve spring. They relieve the rocker at the fulcrum to fit a 1.60, but it can weaken the rocker. That's why those of us with the bigger springs, with higher pressres buy the paired rockers. Call T&D and they'll tell you all about it.