This is not the standard style internals of the stock pump. This is a high volume pump. I'm running one in my 1951 willys m38 jeep. It's doing awesome. I'm getting around 45psi at idle and close to 70psi at high rpm. The company Melling is an awesome company to deal with and when I was rebuilding mine, their tech line was very helpful. Good quality part with good performance.
What kind of vehicle do you drive? 1951 Willys M-38 Jeep