yep were listening . check that stuck valve good . when i got my 53 it had a miss and when i pulled the heads { still remember the confused looks on the son in laws face as he helped / got a look at a flatty LOL !!!!!!!!!!!!!!!!!!!!!!! } found an intake valve that i thought was stuck . well it was bent . the engine was frozen up and when it got free'd up and we thought all was hunky dory nope ! bent a valve as it was frozen in the guide .now the same one , new valve guide , valve , etc. is the culprit for my i cant figure it out , infamous knock . the dain valve springs have given way in her and allowed the stuff to move up and down in one piece just before parking it . no damage other than a i shoulda replaced the d--n springs while it was apart the first time self butt kicking .......................