I ran 2 set of Rhodes lifters. I HATED THEM! Do they work? Maybe. They sound like a bucket of marbles in an empty clothes dryer. Things Rhodes lifter company can't answer: If I run straight 30 weight oil verses 10w30, how will it effect my "bleed down" and thus performance? Can I send them back if they don't increase performance? (NO) When the oil is cold, i guess the bleed down doesn't work as well? How can you tell if the reduction of duration will assist your vehicle if you run a properly selected cam shaft? When they are bleeding off oil are my rocker arms being old properly?