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  1. #1
    My Boats:
    2001 DONZI 38ZX
    Join Date
    Sep 2010
    Lake St Clair, Mi

    502 MAG compaired to the 454 mag

    im looking at trading my boat single 454 mag (385hp) 28zx donzi in for a twin 502 mag (405hp) 33zx donzi. I know the 454 was a good motor no issues and forged. Is the 502 just like the 454? it has around 430hrs on it, and i would like to make sure the motor can be ran wide open all the time like i did with my 454. Anything with the 502 i should look out for? Thanks

  2. #2
    My Boats:
    1994 Baja 236 500HP
    Join Date
    Oct 2005
    Millstadt, IL
    Only difference is bigger bore. Its not just a bored out 454, the walls are bigger around.

  3. #3
    Gold Member Gold Member Dave M's Avatar
    My Boats:
    2017 30 Concept, 300 Verados, Superboat Y2k and 24OS (sold)
    Join Date
    Oct 2000
    LaPlata, MD, USA
    The 502's, if MPIs are 415HP. Take a good look at where the riser/manifold meet. If you see rust on the outside, it's probably time for exhaust.

  4. #4
    Lakeside Commercial Member LAKESIDE RESTORATIONS's Avatar
    Join Date
    Nov 2003
    NorthEastern, PA
    Both known to be good boats.. Both the 454 & 502 have been around a long time & have been known to be good units. Obviously some models were more sought after than others & performed better too. But there was usually a price tag as always to get into the higher performing ones.. Jamie / Lakeside 570-639-2628
    We Make Fast Toys Faster, Cool Toys Cooler and Old Toys New!.. Performance, Custom & OEM Parts & much MORE![/CENTER]

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