[TRADERMIKE 2012]

Pictures of 1967 Pontiac 428 HO spark plugs, I suspect #3+4 are fowled and causing vibration in the Intake Manifold, that was not present prior to the Trans. rebuild. We rebuilt the Center Tri-power Carb. that had an obstruction in it when we took the vehicle off the road 2 years ago. Presently we test and tuned with this set of plugs as seen here. The main thing is we installed the timing back to factory setting until we purchase the degree wheel so we can know where TDC is on the Exhaust stroke. All the other Plugs have a nice Brown look at the positive porclin electrode area