454 repowering

  1. 3

    Possibly blew an engine - 98 454 Gen6 Horizon

    So it looks like I possibly blew my Port engine as I was cruising along at approx 3400 revs the oil pressure dropped to 10 PSI. I grabbed the throttle and pulled it back in and shutdown in a hurry. I bumped the hatch up a bit while I was still moving and had wifey take a look and when I asked...
    • 370
    • Thread
    • 370 370 da 454 horizons 454 repowering engine rebuild
    • Replies: 5
    • Forum: Sport Yachts/Yachts
  2. T

    Engine repower with newer engine or just rebuild?

    I realize the Merc 7.4 MPI 454 is no longer made and Merc does not have re manufactured blocks available anymore. Lost the starboard engine at the end of the 2018 boating season. Having the engine taken out and sent to a local machine shop for a tear down to see what the problem is (stopped...
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