Carbon tracking through rotor. More HEI woes.

RustyRatRod said
I remember some Buicks and Cadillacs in the mid to late 70s had plug gaps at .120"! I always thought that was excessive......but they ran good.

Not so, but close GM had a .060 plug gap for a long time but after B
P said they would pay for any toes caused by fuel line freeze up
and GM had a lot of no starts in cold weather that changed things to .045 gap and the cold start problem went away.