Without proof, I'm a non believer. I don't buy that the stock pump pumps "all it can" through the stock pickup. At least not without concrete data. "He" doesn't provide "that".
I can say without a doubt that I've witnessed engines pump "way more" oil with an HV pump retaining the same stock pickup as with a stock pump. Case and point. A 360 in a 71 Dart I had years ago. Before I built it, it had the stock "drizzle" of oil to the rockers and valve tips. After rebuild and HV oil pump, it squirted oil all over the headers.
