[AzRay]

I'll recheck the timing and check the points setting. However, if it's slightly advanced due to distributor cam slit then manually retarding the spark two or three clicks should stop the noise. It doesn't. I have to raise the lever full up to stop the snapping. I keep saying "Snapping" since it sounds like a secondary spark. Like you pulled a plug wire off and let it snap 2 or so inches to the plug. I've never heard a ping inside an 80 year old engine so don't know what it would sounds like. I thought about a possible ping since the engine is running very rich at the moment and I thought maybe the progression of flame in the enriched mixture could cause pre-detonation, even in a low compression engine. I'm grasping at straws here. Help! :-)