Ive got a 5.7 carb engine wich I put a new crank and bearing in , the engine had 6 hrs from new when it picked up on the crank so I changed that and put it back together . It was running great for 2 hrs and then a tik tik started happening , I thought hyd lifters so I changed them and now the tik tik has gotten worse , Im outta ideas of where to start as Im weary of tearing this motor apart again . Any ideas ?