Diagnosing Engine Whirr

The Jetsons///that's it! LOL I know the sound you are thinking about.... wish it was that! Yes, it is from the front; the stethescope shows it loudest on the front of the block.

Again, if anyone can supply the OD on a /6 cam timing gear, I can figure up the number of crank degrees that corresponds to my FSM's info for stretch limit.