You guys should indicate if your using pedistal or stud mount rockers. I have studs, used a new set of FRPP lifters, new 6.45" pushrods (correct geometry) and 1.7 rockers. Mine are noisy as heck and the puzzling thing is one side (passenger) is noisier than the other. I've replaced the lifters on that side again and adjusted the valve train from 1/4 turn to 3/4 turn, fine tuned the guides and it's all still noisy on the one side. The driver's side sounds like a sewing machine which is fine to me, but the loose sounding tappet noise is not.
bump