The high pressure springs use to be all black, the standard springs, depending on who made the pumps, where not colored or red or silver. I could see the length differences and the tension differences when squeezing them with me fingers
Most of the high pressure and high volume high pressure pumps would bypass at 80 lbs. cold with 10/30 or 5/20 W oil, my motors would have between 20 to 30 lbs. hot(above 170 F oil temps) pressure with 5-20W depending on the idle RPM
I like and use the high volume pumps with the high pressure springs so I can cut them down to get the pressures I want, way better to have to much pressure to start with than not enough
I shoot for 10 lbs. per 1000 RPM hot (above 150 F), 70 lbs. at 7000 RPM