Degrees of total timing for peak horsepower

[Mark Aubele]

Thought it would be interesting to have a thread where people could discuss what total timing they arrived at through dyno testing, or track testing to arrive at maximum horsepower for different cylinder head applications. For example, on my old P headed combo we saw nearly no difference in peak or below the curve between 32-36 degrees of total timing, so we of course decided to run it at 32, and could actually get away with 87 in the tank every once in a while. My current TW headed combo seems to like a bit more timing, and is very sensitive to changes whereas the P heads really didn't care over a very wide range. Unfortunately, an issue with the summit balancer not discovered until I was at the dyno already prevented me from knowing the exact number the car made 347 hp peak at (stock short, N91, TW's, Victor jr, 750DP, and the wrong plugs, too short, I am an idiot) we just had to get close an move it back and forward until we arrived at a number. Anyone have any data they would like to add? Not too interested in initial, the standard "pull the spout and set it at 14" has been discussed many times.