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400 Flexplate? Same as other SBC's?

Discussion in 'The Garage' started by Corey 78K5, Aug 7, 2004.

  1. Corey 78K5

    Corey 78K5 1 ton status

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    400 Flexplate? Same as other SBC\'s?

    Is the flex plate on a 400 the same as other small blocks with the two piece rear main seal crank? If not what is the diffrence and would they interchange with out problems?
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: 400 Flexplate? Same as other SBC\'s?

    NO!!!

    They absolutely will not interchange. A 400 is an externally balanced engine, the other small blocks are not.
     
  3. Corey 78K5

    Corey 78K5 1 ton status

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    Re: 400 Flexplate? Same as other SBC\'s?

    Thats what I thought, thanks.
     
  4. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    Re: 400 Flexplate? Same as other SBC\'s?

    the only other motor a 400 flywheel will fit on is the 383 stroker because it uses the 400 crank
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: 400 Flexplate? Same as other SBC\'s?

    [ QUOTE ]
    the only other motor a 400 flywheel will fit on is the 383 stroker because it uses the 400 crank

    [/ QUOTE ]

    That is not entirely true because a 400 crank will not fit in a 350 block without turning the mains down.

    That said, if you're building an aftermarket motor, it should be internally balanced IMO anyway.
     
  6. Sandman

    Sandman 3/4 ton status Author

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    Re: 400 Flexplate? Same as other SBC\'s?

    I've used them on 454's also. Some people say that should not be done but I have never heard a reason why and I've done it for years. In fact the 454 in my Blazer now has a Flywheel off my old 400 that I blew up.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Re: 400 Flexplate? Same as other SBC\'s?

    [ QUOTE ]
    I've used them on 454's also. Some people say that should not be done but I have never heard a reason why and I've done it for years. In fact the 454 in my Blazer now has a Flywheel off my old 400 that I blew up.

    [/ QUOTE ]

    The reason why is the external weight of the 400 and the 454 are different. /forums/images/graemlins/thumb.gif
     

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