What I meant was more like this...
If we tuned for the 75 shot:
50 HP Shot - +2 Deg.
75 HP Shot - No change
100 HP Shot - -2 Deg.
Something like that. In many cases, a change to timing isn't exactly necessary. However, these 3V engine are pretty particular about excessive timing and will rattle at the slightest chance. It's fortunate that nitrous adds its own fuel which is controllable through jetting. This makes it easy to run just a tad richer and help reduce the possibility of detonation. It may have a slight performance penalty to run a tad rich, but it's certainly better than wiping out a piston from detonation.
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Bill Cohron - The Mad Doctor  
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