Re: Does this engine sound healthy?
Despite all the awesome advice you’ve gotten, I’d leave the stud alone. Put it back togethor and see if it runs quietly. If it does then look into fixing the stud. If not then you’ll need to dig deeper.
Could be a bad lifter or the dreaded flat lobe.
Also your video shows a distinct lack of oil on the rockers. Should be little pools of oil around each rocker ball.
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