Cool Post....
Lots of good info for those of us that are trying to learn the DETAILS of Port n Polishing an engine.

Here is something that might help some of us that cannot figure out all that TIMING stuff, but DO know enough to COPY a Good Thing.

.....O.S. makes a rear exhaust .18 engine that is Hand built and Ported/Polished/Crank Balanced at the O.S. Factory.
If someone were to buy that Engine and take Pictures, we would have an example of what the FACTORY does to its High Perfomance engines.....

Lol...only problem is that THIS engine costs about $250.....