Hayes 455 flex plate.

Discussion in 'Race 400/430/455' started by Billy, Oct 16, 2020.

  1. Billy

    Billy Well-Known Member

    Machine shop called and said the weight on my Hayes flex plate is in the wrong place, it's opposite to where it should be to balance out.
    When installed on the crank the weight faces the engine block like it should.
    So they are going to remove it and weld it in the correct spot still facing the block.
    Anybody experience this with after market flex plates.
     
  2. Thumper (aka greatscat)

    Thumper (aka greatscat) Well-Known Member

    Billy. You're obviously external balancing.is the balancer a external balance one? If it's an internal balance one leave the weight off. FWIW, I've never had a weight on the wrong side.
     
  3. Bens99gtp

    Bens99gtp Well-Known Member

    I had a JW wheel plate that I sent back to have recertification done......they put a different weight on it than what it had before and in a different spot than b4???????????? In fact they actually covered up one set of the converter bolt holes complete.......when I asked them about it they said that where it needed to be so they put it there the rest was up to me to fix.......
    I was pretty upset and had to drill a new set of converter holes.........thankfully the motor wasn't balanced yet......I would had been more upset then.......guess it shows the benifit to internal balancing
     
  4. Billy

    Billy Well-Known Member

    I'm using a romac external balancer.
    I will be going to the machine shop on Monday and will see if the weight is going to interfere with the converter holes.
    Also when I got this Hayes flex plate I compared it to my stock 455 flex plate & everything lined up including the weight in the same location. :rolleyes:
     
    Last edited: Oct 17, 2020
    dan zepnick likes this.
  5. Bens99gtp

    Bens99gtp Well-Known Member

    Take a stk plate with you, I have a romac on mine and used several with no issues
     
    DasRottweiler likes this.
  6. Thumper (aka greatscat)

    Thumper (aka greatscat) Well-Known Member

    Just have the machine shop re weld the weight on when they balance it.
     
  7. Billy

    Billy Well-Known Member

    Yes,
    Hopefully the weight will not have to cover the converter holes.
     
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Better look at the teeth on the flexplate. I had an SFI flexplate that caused me starter problems. It had no offset and it destroyed 2 mini starters before I figured out the problem. The weight was on the engine side. I replaced it with another SFI flexplate that looked like a stock flex plate and the weight faced the transmission like a stock flex plate.
     
    Last edited: Oct 17, 2020
  9. Billy

    Billy Well-Known Member

    Yes,
    The offset is correct I checked it.
     
  10. Billy

    Billy Well-Known Member

    Seen my flex plate today.
    The weight was moved across the plate & will not interfere with converter mounting holes.
    The rotating assembly is balanced out & the rest of the motor is coming together.
    Went zero deck with some wiseco flat tops.
    Shooting for 12.5 to 1 compression.
     

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