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NGK YR5 plugs for BBC

Discussion in 'The Garage' started by rcamacho, Nov 8, 2005.

  1. rcamacho

    rcamacho 1/2 ton status

    Jul 1, 2004
    Likes Received:
    I'm running YR5's on my BBC. The engine is carbureted, ~9.2:1, headers and moderate hyd roller cam.

    Q: YR5's appear to be very cold plugs for my application and are routinely very dark in color. I'm checking O2 mixtures shortly with a sensor, but am curious if anyone else out there has had similar findings with this plug range.

    Q: NGK also lists a UR5 projected nose plug for the same application. Any +/- experience with the UR5 on BBC?

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