OK, well...I may take some heat from this post but I don't really care. I'm not here to fight or argue. I'm here to hopefully give advice that may help someone someday. Someone had put a diaphragm clutch in my car (before I bought it) and left the OC spring in. I didn't have any problems but many many people on FBBO and FABO strongly advised to remove the OC spring. So I did and regretted it the minute I stepped on the clutch. HORRIBLE!!! It made for a very uncomfortable experience. WAY too heavy.
Kudos to 1 Wild R/T. He said "Some diaphragm clutches are fine with the O/C spring". Today, I proved that theory to be true. I re-installed the OC spring and it works AEWSOME. Pedal popped right back up to the top and stepping on the clutch pedal is easy. Perfect gap between the T.O. bearing and fingers.
Maybe 90% of the time it may be true that you have to remove the spring but I will disagree that it must be removed ALL THE TIME when a diaphragm clutch is used.
I really hope this post helps someone because removing/re-installing that spring isn't a fun job. Oh, to re-install the spring, I removed the vent box above the parking brake pedal. That allowed me to slide the pin out a little so that I can re-hook the OC spring.
Lastly, I'm not shifting gears at 6,000 RPMS. I'm a cruiser and I don't want to risk breaking parts. Too valuable of a car.
Again, I hope this helps. And a big Thank You to 1 Wild R/T. I owe you one.
Mike