Let me know what happens.
Not sure you want to drop 2 heat ranges on the plugs though. When you get the current plugs out take a look at them. You might want to try 1 range colder first.

 

Dan,

The only issue I may have with colder plugs is possibly they may foul. However I seafoam every 4K miles or so anyway so that should not be an issue.

If you know of other issues with colder plugs tell me but from my research that should be the only issue I have is fouling.

Ben

 

Back at it.

I put 3 degrees of timing across the board in the beast and started getting retard around 3800 - 4000 with spikes all up beyond this RPM range. None revving up from 1400 or so in 4th gear until this area.

Going to make one more run with 3 degrees timing added in 1000 to 2400 and 3 degrees out above 3600. 2800-3200 I will leave as I had it.

Will tell you how it goes and post my final Datamaster timing no's throughout my RPM's

 

So, what was the final outcome?