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  1. #1
    Join Date
    Nov 2010

    502 Carb Gen 6 Help.....

    Hi everyone,

    I need some help information, I bought a new crate 502 Gen VI from (Great Service) I blow 4 engines in the past 2 years with less than 4 hours on the water each. I swap mechanics as well and that didn't fix the problem ether, so I decide no more rebuild or use fly by night mechanics so I purchase a crate long block engine. Here are the specs of the engine: 435 HP, roller cam, single plane air gap merlin intake, stainless marine 4" thu transon, electronic marine ignition.
    What will be the best performance specs like timing (base & advance), spark gap, carburetor CFM.

    1995 Formula 25 Boating on this same boat since 2001 so I the driver I’m not part of the blowing engines issue.

    Your input will be very much appreciated.

    Thank you
    Last edited by Eclipse1990; 11-14-2010 at 06:59 PM.

  2. #2
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    Timing at 34* full advance at 3000rpms, shoot for around 14* base timing, but let it fall where it may.
    What ignition do you have????
    Spark plugs, AC MR43T or NGK BR6FS gapped at .035-.040
    800cfm Holley carb

    What failures did you have in the other engines??????? 4 blown engines with less than 4 hrs each sounds like a set up problem. Plenty of people have run 1800runsnew engines with good results.

  3. #3
    VIP Member VIP Member akaboatman's Avatar
    Join Date
    Aug 2004
    Baton Rouge La.
    I  Voted
    Ck your exhaust

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