I bought a 68 chevelle ss with a 350 the rokers started making noise so i decided to ajust the lash.I TRIED SEVERAL TIMES AND DIFFERENT WAYS .E/OI/C AND I BROUGHT MUMBER 1 UP AND AJUSTED THE APROPRIATE VALVES ,THEN I DID THE SAME ON #6AND AJUSTED THE VALVES.THE CAR RUNS GOOD BUT THE ROCKES STILL MAKE NOISE. COULD THE LIFTERS POSSIBLY BE BAD .IT IS A HYDRALIC CAM WITH ROLLER TIP ROCKERS. NEED ADVICE THANKS IN ADVANCE FOR ANY REPLYS

Have you tried adjusting them when the engine is running?

yes and when they stopped chatering i took it 4 a ride and the car had no power