Recent content by rosstyler13

  1. R

    89’ Mercruiser 454 7.4L Big Block Backfire issue

    We’re going to take the muffler out and have it rebuilt too
  2. R

    89’ Mercruiser 454 7.4L Big Block Backfire issue

    So my dad had the block done about 2 years ago and have had problems with it since. We rebuilt most of the parts of the engine such as the block the heads and even the carburetor. Now, when getting to 2000 RPM, in gear, it starts to backfire through the carburetor and we have no clue why. We...
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