I was going to try Schubeck's radius lifters when I originally built my 540's two years ago but I decided against it. However, I hear that since then Schubeck has come out with a cam that is more compatible with the radius lifters which is supposed to work out much better---before that he had problems. HOWEVER, I am about to try Schubeck's rocker arms that utilizes the same material as found on his radius lifters. These have NO roller bearings, they spray oil over the springs, are 17 grams lighter over the spring where it counts, are much less bulky, and do NOT have a roller tip but rather have a radiused tip with the special material. These are special made with 1/2" rocker arm studs vs. the standard 7/16" studs that usually are produced. We just went to install them and one of the trunions of the rocker arms would not fit on one of the studs. We mic'd it and found it was undersized by about .019" Also, we found that one of the 1/2" studs was slightly larger at the bottom of the thread line---therefore a rocker arm trunion would not completely seat on the stud all the way. Joe Shcubeck told me to send them back, but we just machined them and correct them ourselves. I'm a little MIFFED at Joe right now---wants top dollar for his stuff but can't seem to get his qualifty control correct---especially when making rocker arms for the 1/2" studs. He has made several of the 7/16" rocker arms but this is his first batch of rocker arms being used for the 1/2" studs. So one undersized rocker arm trunion and one oversized rocker arm stud. I called Joe Schubeck about the problem and he was willing to help, but I can't believe his quality control department missed this! He's going to be getting another phone call from me!
OH BTW, I also ordered 2 of his fuel pump push rods with the special material on the ends. They were OVERSIZED by over .003 and would not fit in the fuel pump push rod boss in my block. We took a new Crane fuel pump rod and it went right in NO PROMBEMO!
I JUST found out about these problems as we were assembling my engines 2 days ago!
I guess we'll see how these new rocker arms of Schubeck's hold out on my engines---at this point I am wondering if I should even try!