I love the lifters I use. The only problem is that the company will only do business with known engine builders. If you are a professional engine builder and have some sort of proof, contact me and I can share this source. If not the best I can do is take orders and sell.
The .842 size has handled 380 # seat and over 1,000 lbs open with lifts of over .940 with no issues for a full season and they are supposed to be rebuildable.
The .904 size was handled 470# seat and above 1250 lbs open with lifts of over 1 inch for a season and looked good.
These do use internal oil channels to oil the rollers and are a cut-away design similar to the Crower Hippo or Isky Red-Zone. The price is a little less than the either of those but is not cheaper like the Crane or the Comp.
EaCH ORDR IS A DIFFERENT PRICE DEPENDIONG OF WHAT IS NEEDED i.e. sTRAIGHT oFF-SET SIZES LIFTER BODY HT ETC. (Caps lock sorry).
If you are in business as an engine builder please send me phone or email and I will turn you on to this product. If you are individual, I can not, becuase of the supplier's policies.
Ed