There is no specific single timing for all engines. It depends on the use to which it is put and the manufacturers specifications to suit that use.
You need to check the manual for the specifics.
8 to 10 degrees
6 to 8 degrees before top dead center.
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you need three things for an engine to run. proper air/fuel mixture, compression and spark at the proper time.
0 degrees
this question can not be answered with out knowing what engine the f-350 has. and what year.
Knowing the year would really help. But 90% of the 350 TBI engine timing was 0 TDC.
The timing on that engine is computer controlled. It requires an engine scanner to set the timing. No other way.
It has timing chain and gears. NO belt.
You can not use a timing light to set the timing on that year engine. The timing is computer controlled and it requires a engine scanner to set the timing.