Tuning with jets, Power valves and an O2 guage

The 509 valve closing is advertised. The Lunati is @ .050".


:banghead:

This was my point. The MP numbers are the "advertised" numbers. I thought that the .050 number PLUS 15 degrees gets you back to the advertised numbers.
Is this not a direct comparison?
Yes...I have taken the distributor as far as it can go with the Mallory springs. To slow the advance any more, I'll need some bigger springs.