Funny thing about this thread (not really) is we have been fighting this lifter issue since Harley started producing the 110 motor. I'm sure there might have been a few 103 lifter issues but I really don't remember any. I have a 2014 110 punched to 113. When I did the build some 36000 miles ago I tried to use the best parts available. I broke the cases and installed a new S&S crank, went with a feuling pump plate and lifters, Zippers did the heads and bored the cylinders. That was 2 1/2 years ago. Now I didn't have any problems but I had installed TC24D cams in the motor when I built it and wanted to change them to T Man 600sm's. Also I wasn't sure but I thought I may be having issues with oil pressure. I called and talked to Feuling and also talked to Axel about the oil pressure at idle. Everyone thought that there was an issue. I removed the oil pump and it looked new. I pressure checked the cam plate and the relief valve was opening early. I replace the spring and put the bike back together. I now have GREAT oil pressure.
Now back to the thread. While on the phone with Feuling I asked how long should their lifters last. I was told that if everything is set up right ( even spring pressures) that they should last the life of the engine. The life of the engine?

? Really?

? Yes the life of the engine. We know the factory lifters are junk. I personally use either Feuling or S&S premium lifters on any build or lifter replacement I do in my shop. I have yet to have a lifter failure. But we all know that can change.
Now for the $64000 question. Why all of the problems with the dreaded 110 motor and not the 103's?

?
Be Safe
THE DAWG