don't install the flywheel at all!
and here's why:
the flywheel (the stock flywheel that is) will work very nicely with the rpm you're getting by removing the governor (+/-5500 rpm)
And, with that rpm, the stock timing is about perfect;
so installing the offset key is indeed "lowering" the power slightly.
what it will do is allowing the engine to rev faster (7000 rpm ...maybe above)
[and that'd require at least stiffer valves springs too]
since that's where the "new modified powerband" will be after installing a flywheel key.
NOW, a stock flywheel at that rpm, can be a very dangerous thing;
you wouldn't want to be within a 50 feet radius when that thing decides to desintegrate.
So a billet flywheel is what you need to rev that high..
And now comes the funny part:
Most common are the ARC flywheels, and they do come with a timing advance of 8°;
exactly what the key provides, just a lot safer than a key.
and you CAN'T install that key or else you'd advance by another 8° (and the engine wouldn't even start )
So, yeah... back when the billet flywheels had no internal timing advances, a flywheel key was a good idea..
today they're pretty much pointless.
(well installed in reverse you can get a 8°, 6° or 4° key to adjust the timing in the non adjustable billet flywheels from stock to +8°, depending on the track you'd want to run...)
So, billet flywheel if you want to rev higher than your removed governor can take you (and you don't need a key since the timing already IS advanced)
or stock flywheel if you're happy with the rpms you're getting (and you don't want that flywheel to keep your power at that rpm band, and safety to not get hit by a cast chunk of metal flying towards your neck)
'sid
