I found that..
there are 2 different versions of the T&D's.
"Econo version" = no brgs in the roller tips.
"Hi buck" version, [AIRC $13.00 ea additional rocker] = needle brgs in the tips.
Easy way to tell, look at the tips to see if there's a small washer on each side of the roller.
The older version of the Scorpions = junk. Had 8 of the 12 w/ the roller tips locked up, after only a short time.
I monitored oil temps, and found a significantly lower temp w/ roller rockers. [15*, as I recall.]
+1 on Race Jace's comment....