S&S = Delhpi
GMR = Delhpi
Woods= Morel
comp cams 850= Eaton, Morel, delphi , mexico+ else where as they are NOT all made by same company.. SO some have great luck others well may not.. To comp its about cost on the day they re order stock
There are two types of low mass check balls ceramic and alloy .. We do not use the ceramic , in cars they had a high % of failure and the next lifter to replace it was made the way ours is.. S&S does use the ceramic and I have not seen an issue with it however. I also toy in the high performance car area as well and there I have seen it. That was the reason we went in another direction..
Lifter failure can be caused by many things, low oil pressure, dirt, incorrect spring pressure , and then plain old poor quality parts.. ( stock falls into that box)
There are many lifters out there that work very well and S&S is not the ONLY game in town as there are but a few place to have lifters made . Buy a known quality lifter and you will be fine.. And ever manufacture in the lifter game will have a failure no two ways about that.. It will happen.. But a No BS warranty for a year takes care of that. Good luck