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[adkg12]

Ok so.. I couldnt find anything here by searching.. so.. Is there an actual, easy way to test a lifter to see if its failing..?
Glen

[HD Street Performance]

Yes and no
Mechanically rollers and roller bearings fail and it takes a visual inspection to confirm this. More than likely a lot of noise is the first clue.
If you have a lifter out of a motor it can easily be tested for leak down. I use a Kent Moore J-5790 tester to accomplish that on all the lifters I sell.

[Ridgerunr]

Don, care to post any results of your testing?

[HD Street Performance]

A few that I know,
There are always a few anomalies but I can tell what I typically see.
Testing with 10w oil, range of travel .125, room and oil temperature 65°F

HD 18538-99B lifter, used, usually in the 15-20 seconds
HD 18538-99C lifter, used, too fast to time <5 seconds
Premium Delphi HDSP lifters, new, 30-35 seconds, >30 seconds or they are rejected, these are also previously tested by Delphi
Morel 5475 lifters (BBC Marine, Not HD lifter), new,  >45 sec
Send me others I will test them.

It should be noted that all Delphi based lifters which include S&S call for maximum oil API viscosity rating of 10w/40 and a minimum oil pressure of 16lbs.

[Para Bellum]

It should be noted that all Delphi based lifters which include S&S call for maximum oil API viscosity rating of 10w/40 and a minimum oil pressure of 16lbs.

How does the 20w-50 viscosity that most of us use (including the stock Syn3) affect the lifters?

[HD Street Performance]

Splitting hairs really it is not that far off.
It bleeds off slower but also takes longer cold to pump up so there may be a click or two on initial start
Backup for my oil pressure statement is attached

[Ridgerunr]

Thank You Don, gives some insight many of us would not have access to.

[Para Bellum]

Splitting hairs really it is not that far off.
It bleeds off slower but also takes longer cold to pump up so there may be a click or two on initial start
Backup for my oil pressure statement is attached

Thanks for that; good info and appreciate the analysis.