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ac delco

  1. shady

    So what's the current recommended spark plug for mark IV big block

    I know everyone always said not to use Bosch platinums in my 350, and there was a few suggestions made that had worked well for others. But I haven't bought any for a big block yet. Normal low power 80s 454 with stock peanut port heads. Bored .040, no idea on pistons. Semi smooth, but bigger...
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