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TO ALL:
In doing the HVX mods you must drill two holes which result in the connection of the right-side tappet oil gallery to the #3 cam bearing.
THIS DRILLING IS CRITICAL!
On some engines there is not enough metal to allow the two new holes to connect without breaking through to the outside of the crankcase. THIS WILL DESTROY THE CRANKCASE.
Before doing the drilling you must make sure there is enough metal. A warning to that effect has been on the drawings since they were first uploaded but in some cases it is difficult to take an accurate measurement, in others the builder lacks the proper tools.
-R.S.Hoover