Retarding initial timing

[speED]

Sorry guys I have submitted any replies, but my modem keeps failing causing me to loose internet and home phone. I'm going to clean plugs and return to a previous ignition curve when the plugs looked good in terms of air/ fuel ratio. It may take me a few days to update my progress but I will let you know the outcome.

Before I loose internet again I will quickly answer some of your latest questions:

Yes I'm running 4.5 power valves and realize if they leak it will create a rich condition.

Trying to run 93 octane from the pump.

110 cc heads

Yes I saw some pepper spots on the porcelain. The ground strap looked good at 18 degrees of initial timing, when I retarded the timing I was looking to see how it would affect the detonation and assumed I would go back if the discoloration moved too much towards the tip.