You might want to play around with the timing advance a little,
though. Five degrees ATDC is pretty far retarded, and was chosen by
the factory largely for emissions-control purposes. If you can
advance the timing a little without pinging, your power and fuel
economy should increase.
My '72 250C has a factory spec of 4 degrees ATDC, but even with
87-octane gas, it runs much better and stronger at about 7 degrees
"If you find yourself in a hole, the first thing to do is stop diggin'."
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