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Technical Small block harmonic balancer?

Discussion in 'The Hokey Ass Message Board' started by erock805, Dec 30, 2017.

  1. erock805
    Joined: Jul 30, 2006
    Posts: 1,246

    erock805
    Member

  2. squirrel
    Joined: Sep 23, 2004
    Posts: 38,520

    squirrel
    ALLIANCE MEMBER

    looks like a 327 or 307 damper? or maybe a 283? how about measuring the diameter....????
     
  3. Deuces
    Joined: Nov 3, 2009
    Posts: 13,318

    Deuces
    Member
    from Michigan

    And thickness.....
     
  4. uncleandy 65
    Joined: Jan 14, 2013
    Posts: 230

    uncleandy 65
    Member

    Hard to tell by the picture, but it looks to thin for a 350
     
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  5. Deuces
    Joined: Nov 3, 2009
    Posts: 13,318

    Deuces
    Member
    from Michigan

    That's what I was thinking.....
     
  6. larry k
    Joined: Feb 23, 2009
    Posts: 237

    larry k
    Member

    265 or 283 ,to light for a 327 on up !
     
  7. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 4,759

    56sedandelivery
    Member

    NOT a 265 or 283, those are riveted together, although some 283's use just a "hub" with NO elastomer or ring of any kind. So, 327 AND early 350. Do a Google search for "Images of SBC balancers" (I prefer to call them dampeners). Factory and aftermarket balancers/dampeners are displayed. The "High Performance" dampeners are usually larger, but we all know ANY of these dampeners can be swapped around that are neutral balanced, and the appropriate timing tag used. We use a lightened or lighter weight flywheel to allow engines to rev quicker, same with a dampener. I'm not sure how the larger dampeners came to be used, unless it's because of all the accessories driven off of them, and the torsional issues associated with those. But then again, I'm NOT an engineer by ANY means. To answer the OP question, "Is this a normal 350 balancer"; it is AND is't. Use it, I would. I am Butch/56sedandelivery.
     
    Truckdoctor Andy likes this.
  8. DDDenny
    Joined: Feb 6, 2015
    Posts: 8,388

    DDDenny
    Member
    from oregon

    Pull that center bolt out and take another photo.
     
  9. Deuces
    Joined: Nov 3, 2009
    Posts: 13,318

    Deuces
    Member
    from Michigan

    I took another look at it and it looks like one for a 350... We just need a side shot photo of it to confirm...
     
  10. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 235

    MAD MIKE
    Member
    from 94577

    In relation to the keyway/spoke on the damper.
    If the outer ring has not slipped I *think* the timing notch is in the position for '70s SBCs.
    IIRC pre-'350' dampers had the timing notch in the 12 O'clock spot.
    80's SBCs used that funky timing tab mounted behind the waterpump with the notch ~45° before.
     
  11. TagMan
    Joined: Dec 12, 2002
    Posts: 5,476

    TagMan
    ALLIANCE MEMBER

    Pull it off and check for casting numbers
     
  12. Should work on a 350, however the elastomer- rubber ring looks to be NOT in the best shape. Outer ring can slip, and or walk.
     
    Just Gary and badvolvo like this.
  13. Mike VV
    Joined: Sep 28, 2010
    Posts: 934

    Mike VV
    Member

    Standard performance 327 damper (harmonic damper), maybe even early low perf. 350.

    A balancer...balances things, a damper...dampens things (harmonics).
    These devices, dampen crankshaft harmonics. They don't balance...anything.

    Mike
     
    mad mikey likes this.
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 38,520

    squirrel
    ALLIANCE MEMBER

    that's for sure. I've given up on that pet peeve. Good to see someone is still after it
     
  15. The one for the 350 should be 6.75" in diameter. I got mine at Summit for around $65.
     
  16. badvolvo
    Joined: Jul 25, 2011
    Posts: 169

    badvolvo
    Member

    Either way, looks like its time for a new one.
     

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