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I've got the 5.3 in my 99 GMC w/170K on it and it does sound like a bad rod knock for the first 2-3 minutes. I'm running 10-30W oil. Runs fine, still has oil pressure like it was new, just loud at startup.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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