Originally posted by Brown_Muscle
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Yep. I was initially confused about which cylinder had been making noise ... turns out both my memory and my post from 10 years ago ware incorrect; this was the intake lifter from #6, not #7 as I remembered or #5 as I posted here. Weirdly, the process of scaring up the bad lifter took several days after initially pulling the intake, with increasing confusion when I couldn't see any damage. Should have just pulled all 8 on that bank to start with!
The wear patterns on the busted roller look to me like this lifter may have turned sideways. I'm not sure now where the dogbone was when I went to pull this pair of lifters, but especially considering these unusual wear marks on the corresponding pushrods, I'm guessing now it had bounced out of place because of the retainer being loose.
So far I only have it far enough apart to pull lifters on the left bank, but obviously I'll need to change the cam now, as I had been suspecting for some time. That will be a little annoying, as this car still has its (non-functional) air conditioning compressor taking up space. I borrowed a borescope from AZ, so the boy and I have found it interesting to peer in at the damaged cam lobe. I dug through my stash of gaskets early this past summer, and I think I've got everything I need except RTV and/or Gaskacinch. I'll be putting it back together with my '90 Mustang GT cam and Performer 289 intake.
Thinking I should at least change the oil a couple of times once it's all back together!
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