BBC 454 flexplate ?'s - Reply to Topic

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Topic Review (Newest First)

  • 06-23-2008, 04:50 PM
    2savage4you
    I think if i just buy a new flexplate, i will be fine.... i compared mine to the one Pw_Tony gave me. The counter weight on mine looks to be seperating from the plate, so that is why it is hitting. Not to mention my flexplate is slightly warped


    I would like to see some feedback on these flexplates before i buy one.. Thanks...

    2sav
  • 06-23-2008, 04:26 PM
    H20MOFO
    I had my flex plate on backwards earlier this year and it bolted up fine,and the starter worked fine(sorta but thats a long story) nothing to do with the flexplate. I've also had a 396 flexplate on a 454.. like outlaw said you'll know it real quick. I don't think a 5 sec fire up would hurt anything.(drive shaft out) If I remember right I had more clearance with it backwards. When Tom JBP told me mine was backwards...I told him who cares it works.. and then he told me I shouldn't run it that way, I just can't remember why.
  • 06-23-2008, 03:56 PM
    eliminator
    The shim is the trick , I had the same problem, the shim gave me around 20 thou clearance.
  • 06-23-2008, 01:17 PM
    2savage4you
    What do you think about this set up. A shim and a TCI flexplate
    That should do the trick...
    http://www.jegs.com/p/TCI/748595/10002/-1/10537


    http://www.jegs.com/p/TCI/746478/10002/-1/10537

    2sav
  • 06-22-2008, 07:05 PM
    2savage4you
    Quote Originally Posted by Outlaw View Post
    You will figure out real quick if you have the incorrect flex plate installed,

    I dont want to put myself in that situation....... Well i found the problem.. The counter weight is seperating from the flexplate. Thats fine i would rather have a new one anyways Thanks for all your reply's.

    Its time to Ebay

    2sav
  • 06-22-2008, 06:16 PM
    Outlaw
    You will figure out real quick if you have the incorrect flex plate installed,
  • 06-22-2008, 06:09 PM
    1/4 Miler
    Quote Originally Posted by 2savage4you View Post
    Where can i find one of them dooo hicky thingy's

    2sav
    Square of 6061 T-6 plate of appropriate dimensions and a mill. Ring/hole pattern helps.
  • 06-22-2008, 06:01 PM
    2savage4you
    Quote Originally Posted by obnoxious001 View Post
    It looks like it's possible you have the flexplate on backwards. If I am not wrong, I can see the outline from where the crank was against the flexplate previous. Pull the adapter off, and get a good look at the center. Most flexplates have a slight flange that faces away from the engine. A 396/427 flexplate will have no counter weight, a 454 will (but also a 400 sbc flexplate will as well, that is not correct for a 454). By the above photo, I would guess that flexplate was against a cast BBC crank.


    Well it has the counter weight, but no telling its for the 454.... I dont beleive its on backwards, the weight is on the inside just like a car would be........ I have another one Pw_Tony gave me, but i think its a little warped. I just checked it on my bench... $50 bucks for a new flexplate aint to bad, as long as it fixes the problem

    2sav
  • 06-22-2008, 05:47 PM
    obnoxious001
    Quote Originally Posted by 2savage4you View Post
    My set up
    It looks like it's possible you have the flexplate on backwards. If I am not wrong, I can see the outline from where the crank was against the flexplate previous. Pull the adapter off, and get a good look at the center. Most flexplates have a slight flange that faces away from the engine. A 396/427 flexplate will have no counter weight, a 454 will (but also a 400 sbc flexplate will as well, that is not correct for a 454). By the above photo, I would guess that flexplate was against a cast BBC crank.
  • 06-22-2008, 05:42 PM
    71hallett
    Quote Originally Posted by 2savage4you View Post
    I was wondering if i had enough clearance , because there has to be some type of flexing at high rpm's?

    Dont really know, im putting a puzzle together that somebody else took apart.
    2sav
    I was more thinkin when the starter hits it that it might crack where it meets the crank. Again I am not sure.
  • 06-22-2008, 05:36 PM
    2savage4you
    Quote Originally Posted by 71hallett View Post
    I couldnt even tell you by looking at them either. Not totaly up on it but I would also think that a plate like tci or something might not flex as much aswell. (no converter holding it straight) Is this even a factor on something like this?

    I was wondering if i had enough clearance , because there has to be some type of flexing at high rpm's?

    Dont really know, im putting a puzzle together that somebody else took apart.
    2sav
  • 06-22-2008, 05:33 PM
    2savage4you
    Quote Originally Posted by Pw_Tony View Post
    Does that other flex plate fit?

    Later on when it cools off i will go check, I actually forgot about that one

    I got alot more chit done to it today, this bitch is getting close.
    Thanks tony.

    2sav
  • 06-22-2008, 05:31 PM
    71hallett
    Quote Originally Posted by 2savage4you View Post
    Yeah, i know... I just dont remember if it was or not..........Went thru alot of BBC's recently and got some parts spread out, I think im better off buying a scat flexplate and be done with it

    This way i know for sure.........

    2sav
    I couldnt even tell you by looking at them either. Not totaly up on it but I would also think that a plate like tci or something might not flex as much aswell. (no converter holding it straight) Is this even a factor on something like this?
  • 06-22-2008, 05:30 PM
    Pw_Tony
    Does that other flex plate fit?
This thread has more than 14 replies. Click here to review the whole thread.

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