Just another data point.
5W20 for over 20 years now in a 0.030 over 455. 80 psi pump. Street strip.
Bottom end is ~ 40 years old. Numerous changes through the years; cams, heads, intakes, carbs, ignition, etc.....
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79 Trans Am WS6
71 Formula
72 Formula
71 Firebird
69 Firebird
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