Early drives like Tracy, Ed, Bill Eslick(? havent heard), Todd Bartrim (havent heard), Chuck Dunlap (havent heard), Tommy James (havent heard) and I (so far) don't seem to have a problem while you and Mark who have slightly later versions are having loosening.  (Have we heard from John Slade or Steve Brooks and I missed it?)  Any other high-time re-drives that I left out?)  - What about Tom Parks? (turbo 20B with Ross Drive).   It's possible that power is the main issue (average torque), but it seems to me that peak torque and torque variation amplitude are what are going to matter most.  You and Mark are going to have lower peak torque than those of us with turbo engines, and with 20B's you are are going to have lower torque amplitude than even those with n.a. 13B's.  Only your average torque is higher.  Seems strange... that is why I am wondering about some sort of change to the later mod
els of the gear drive.  Tracy?
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David Leonard