Originally Posted by 89FLHTC

I actually just went through this myself and found that deeper is not always better when it comes to lifter pre-load. My pushrods are also 24 tpi and I had set them at 3 1/2 turns and the lifters were super noisy. I started over and set the pre-load at 2 turns and 5 flats and the noise was drastically reduced. My guess is that the reduced oil chamber between the piston and the bottom of the lifter (less oil) causes more noise on some lifters . If I were you, I would set them at 2 1/2 turns. Go by your lifter instructions but most will want the preload set at the mid point of the piston travel. If they are noisy after it gets hot, go another flat or 2. I think some lifters respond differently than others. Make sure you do this when the engine is cold (sat overnight). Keep us updated on this.

Originally Posted by 98fat

I have S&S lifters and quickie pushrods they are 24 also. S&S recommends 24 flats (four full turns). I found them to be a bit noisy. I did 28 flats and they quieted right down. Be sure your motor is COLD not cool and make sure you are on TDC compression stroke. Good luck.