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					Originally Posted by  djmtsu
					 
				 
				Quoted from 7club- 
  
The reason you lock the timing on a first gen dizzy blowthrough is the fact that the dizzy will NOT retard the timing under boost. At 10-15 psi under full boost you would only need a maximum timing of 5-10 degrees. So you lock the timing to where you would need the it at full boost. 
			
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 That's just leading timing, and actually you lock it so it doesn't advance timing while the engine is under boost. 
 
Trailing timing and split is obviously a source of contention among people. Everyone has a preference and an idea of what is safe. If that's what allegedly works, then go with that.