The only issue I have with this is, per the instructions, you:
Here are the following steps:
Replace Drain Plug
Run till oil is clear *****
Install New Filter
Run Engine (One Minute)
Check Oil Level
On an Evo engine, I have no problem with this, because the oil filter is the LAST place the oil goes, before returning to the oil tank.
On a TC engine, (Twin Cam), it's the opposite, in that the oil goes from the tank, to the pump, then to the filter, THEN to the engine.
Running the engine with the filter off on a TC engine, means you're running a dry engine, as the oil that would be going to your crank/top end, is now going out of the engine. To boot, you're then installing a dry filter, and the engine will continue to run dry, until the filter is filled and the oil starts back into the engine.
Will it harm the engine, considering it has roller bearings and not babbitt bearings? Unsure, but the tappets and rocker arm bushings are lubed with high pressure oil and are bushings, not bearings. Newer (2007-up) cam plates are bushs, not bearings. Bushings and babbitt need high oil pressure to run on an oil film, not just oil presence.
The amount of "dirty oil" remaining in the engine after a proper oil change is about 1-2 cups, if that.
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012
"Your Jedi Mind tricks will not work on me...... ~Misinlink-2016~
2005 E.G. Classic
S&S 510 cams
Baisley Oil pump spring
SE 3.5" pipes
S&S adj pushrods