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Thread: Mixture confusion/frustration!

  1. #1

    Default Mixture confusion/frustration!

    Hi people. I need your help as I'm new at this. I have a Holley 4160 600 cfm on a late '80s/early '90s Ford 302 Windsor. The engine runs smoothly, vacuum secondaries open OK. But the frustrating part is plugs 1, 2, 3, & 4 are sooty and the rest are fine. Huh? I have put a rebuild kit through the carb and it has .65 jets. I live at sea level. Could it be a manifold issue?

  2. #2


    If it's a "dry" soot, it could be valve seals leaking oil, or even piston rings. If it's a "wet" soot, it would be fuel. Hope this helps.

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