Review on Fel Pro 72401 O Ring by Mike Littlejohn
If your 5.3 is low on oil pressure and the tappet is ticking, that could be your problem as it was mine.
My Yukon had low oil pressure to the point of no cold starts and shook 40 times. I installed a new o-ring and it now has 50psi cold cranking pressure. I also had a fairly loud ticking at idle but it went away after I replaced the o-ring. I would definitely replace this o-ring before installing the new oil pump as this appears to be an issue with the 5.3 and an oil pump change may not be necessary. Very satisfied with the product.
- Everything is fine!
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