I had a 572 big block engine, 750 hp. I made a fatal mistake, I am old school, thinking the most expensive oil and thicker oil was better, I was using Kendal gt1 racing oil, my engine got a knock very soon. The thinner oil get's circulated easily, the thicker oil could not lube the engine because of the tight tolerances.
So now run synthetic 5-23
this problem also caused to a new 350 gm engine.
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