Hi, A cheap way to check is with a length of broom handle. Hold one end to your ear and the other end on the valve covers in different spots. Leo QCI At 04:47 PM 13/03/2002 -0800, you wrote: >Is there a definitive way to tell the difference >between a clicking lifter and an exhaust leak from a >cracked exhaust manifold? > >Been down the road of replacing lifters only to find >it was a cracked manifold once before. > >Kerryp