I chased a ticking 340 for over a year. wiped out 2 cams. I finally found 2 galley plugs in block missing (previous builder). I rebuilt the engine, still ticked. all oem replacement shafts etc. I finally figured the lifters needed more collapsing, so I ordered .080 longer pushrods. the motor is quiet as a lexus and over a year of tick free driving. just my .02 on the subject.
