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BBC Flexplates

Discussion in 'The Garage' started by DieselBurb, Mar 23, 2004.

  1. DieselBurb

    DieselBurb 1/2 ton status

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    Will a 454 flexplate work on a '71 402? /forums/images/graemlins/dunno.gif
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    NO, 454 is all by itself when it comes to flexplate/ flywheel. 454's are externally balanced and the rest of the BBC's are internally balanced.
     
  3. thor

    thor 1/2 ton status

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    No the 454 is externally balanced the 402 is internally balanced. A 350 on will work on the 402 though as both are internal.
     
  4. DieselBurb

    DieselBurb 1/2 ton status

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    How do I tell the difference between an internally and an externally balanced flexplate? Will the internal be missing the extra weights on it?
     
  5. DieselBurb

    DieselBurb 1/2 ton status

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    Bueller???? Anyone????
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    I'll tell you in the next day or two when my SFI flywheel comes in the mail (thanks to JEGS).

    As of right now I have a 454 externally balanced. It had an externally balanced harmonic balancer, an internally balanced flywheel (for manual 4 speed tranny), and a counter balance weight (to make up for the zero balance flywheel). I am installing an automic so I needed a flexplate. I decided to go with a zero balance flexplate and use the counter balance weight as I will turn this into an internally balanced 489-496 someday down the road and didn't want to have to buy two different flywheels, plus I know the counterbalance won't change this way.

    When it comes, I will snap a pic or two for you.
     
  7. DieselBurb

    DieselBurb 1/2 ton status

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    Sweeeet, thanks!!
     
  8. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    I forgot to snap pics, but it looks exactly like one used on a SBC 350. No additional weights or material removed.
     
  9. DieselBurb

    DieselBurb 1/2 ton status

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    Thanks for the info. /forums/images/graemlins/thumb.gif /forums/images/graemlins/waytogo.gif
     

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