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Thread: 427 / 454 Flywheel ??Difference??

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  1. #1
    jsthunter is offline Registered User Visit my Photo Gallery
    Join Date
    Jul 2007

    427 / 454 Flywheel ??Difference??


    Hey all , new to this forum. I hope i am clear with this situation. I work for a rebuilder who recently sold a split seal Marine 454 engine. On startup the engine shakes dang near out of the boat. I never had this customers flywheel, so i used a master flywheel i had to balance (454), and a brand new dampner also for a 454. We hot ran the engine an it performed beautiful.
    We took the master flywheel off, and sent the engine to the customer... the customer installed and started it and all hell broke loose. I know that the 454 is externally balanced and vice versa...but does anyone know a distinct difference between the 454 or the 427 flywheel.

    Thanks in Advance


  2. #2
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2007

    Give the customer the balanced flywheel. Pandora's box just opened and she is not in a good mood. The gram weight difference is enough to make the bravest man quake in his boots.
    What if the "Hokey Pokey" is what it's really all about?

  3. #3
    Henry Rifle's Avatar
    Henry Rifle is offline CHR Member Visit my Photo Gallery
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    Apr 2004
    Little Elm
    Car Year, Make, Model: 34 Ford Low Boy w/ZZ430 Clone

    454 takes an externally balanced flywheel and an externally balanced damper. Switch out either one for a 427 version, and you have a milkshake machine.

    The 454 flywheel will have an obvious counterweight on the backside. The damper will too, on the inside.

    The top picture is a 454. The second picture is a 427. The third picture is a 454 balancer. The 427 balancer doesn't have that large counterweight.
    Attached Images
    Last edited by Henry Rifle; 07-18-2007 at 07:44 PM.

    Gone to Texas

  4. #4
    Futs's Avatar
    Futs is offline CHR Member Visit my Photo Gallery
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    Jun 2007

    Most 427's are internally ballanced.Send him the flywheel you used and charge him for it.

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