What ignition advance for a 351W ?

[rouge67]

What is the good timing mark for setting the initial advance? I heard that the good value is arround 10° instead of 6° shown in the manuel. The advance is depending of the octane fuel number. Here in europe the number is 95. How much in 1969 ?

[Thierry]

I searched the web and all I have found is the posts you submited in other forums  :lol:
 I really don't know the answer and what was answered still doesn't mean anything to me but as the european and north american octane rating can't be compared I guess you will probably get a better answer in a forum with european users. In 1969 there was also a different method to rate octane.
 The mechanical stuf is not my domain and I hope you will find the answer.
 Is your Mustang running bad?

[rouge67]

My engine seems running good, but I'm asking what would be the best advance setting. Many owners say the good setting is arround 10°. I think that the today octane number is higher than in the past. Thus, the advance would be reduced. I want to know why somes do the opposite.

[Russ]

I think that it is 8*-12* is a good range you might have to try to set your advance forward and igit. to 8 and that might help let me know either way. STANGOUT

[rouge67]

Thanks, I read that the most important setting is for high R.P.M. : max advance; initial+mechanical; must be 36° to 38° with vacuum disconnected and plugged. Not yet tried this.