I have the Precision
Oil Pumps rockers and push rods from Doug. I had one rocker brake which also caused the push rod to bend. I contacted Doug he sent me free of change a new rod and rocker. I have had his setup for about 4-5 years with 8K miles currently. No other issues than the one above. I have a Crower solid cam with a 618-lift/320 duration, Edelbrock heads massaged by Keith Craft however I do not remember my spring rates. I have probably wound up the motor briefly to about 6K rpm's.
I would buy them again from Doug if needed.
Mike