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**hatzie** · 07-11-2020, 03:06 PM

A rod knock should be more pronounced and rhythmic. Not saying it's not but I'd start looking for loose stuff.
If it is the beginnings of a rod knock it will get progressively worse.

If you wiped out some rod bearings the oil pressure will probably be lower than it was before.

You can drain your oil and look for the teltale glitter of wiped bearings.
You can also cut an oil filter open with a big pipe cutter. Opening them up with other tools can leave shavings behind. Pipe cutters or oil filter cutters cut through with sharp wheels unlike a die grinder or hacksaw.
I have an old 4 wheel Ridgid 44S I picked up at a yard sale for cutting open spin on oil filters.

07-11-2020, 03:06 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,022	Re: 8.1 engine knock or something else? A rod knock should be more pronounced and rhythmic. Not saying it's not but I'd start looking for loose stuff. If it is the beginnings of a rod knock it will get progressively worse. If you wiped out some rod bearings the oil pressure will probably be lower than it was before. You can drain your oil and look for the teltale glitter of wiped bearings. You can also cut an oil filter open with a big pipe cutter. Opening them up with other tools can leave shavings behind. Pipe cutters or oil filter cutters cut through with sharp wheels unlike a die grinder or hacksaw. I have an old 4 wheel Ridgid 44S I picked up at a yard sale for cutting open spin on oil filters. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.