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FED 387 · 03-26-2017, 02:36 PM

GM had a bulletin # PIP4499B regarding lifters also u might check oil pump O ring over time (yours is old 248K and 10 years) they get hard and do not seal properly allowing air to pass thru the system and causing intermittent oil pressure very common in 5.3 engines

03-26-2017, 02:36 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 522 Liked 330 Times in 178 Posts	Re: 5.3 LS Top End Noise GM had a bulletin # PIP4499B regarding lifters also u might check oil pump O ring over time (yours is old 248K and 10 years) they get hard and do not seal properly allowing air to pass thru the system and causing intermittent oil pressure very common in 5.3 engines