[25stevem]

It would really help us to not so much guess if we knew more details about the motor!

Out of gear and with no vacuum advance Have you confirmed that above 4000 rpm to 5000 rpm that no additional timing is coming in?

Also needed to be confirmed is that in the above conditions that the timing is not bouncing around when the motor is at a steady rpm above 4000 or so.

I have found that some brand of rotors are truly garbage!

I have a old HEI cap that I have jig sawed out two wire terminals such that I can see how close the rotor tip is to the wire terminals.

All too many times this gap is more then what your running for a plug gap which is not good in anyway!

With some rotors you can bend them to extend them closer to the wire terminals.

Just make sure that the rotor tip does not then run below the wire terminals making for a gap in that regard .

Can you post up some photos of some of your plugs so we can look at the coloring and heat range?

Also what issues are you experiencing at WOT?