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Internal balance or External 383 question

Discussion in 'The Garage' started by CaveBlazin, Apr 13, 2004.

  1. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Ok Im not a machinist by no means but is it cheaper/better to have it internally balanced or externally? I just dont want to get ripped off cause Im not engine smart on the 383? Thanks
     
  2. alaskanbowtie

    alaskanbowtie 1/2 ton status

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    no real advantage, other than you can use your existing balancer/flexplate with an internal balanced crank and if you have nice stuff that could be a benefit and another expense you won't have to worry about.. Scat makes an internal balanced series 9000 crank that's good to 500 h.p.& 7500 rpm's and it's for 6.00" rods which is a very nice addition to building a 383. oh price is about 200.00 on ebay for a new one, good luck! /forums/images/graemlins/thumb.gif
     
  3. Lonnie

    Lonnie 1/2 ton status

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    Internal balance is better as you try to correct the balance near each rod, not at both ends of the crank.

    External balance requires the use of a 400 balancer & flywheel. If upgrading from a 350, you need internal balance to reuse your old parts.
     
  4. bigburban383

    bigburban383 1/2 ton status

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    OEM externally balances their engines, because its cheaper if that tells you anything. Internally balancing is the way to go /forums/images/graemlins/waytogo.gif
     
  5. Thunder

    Thunder 3/4 ton status

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    xternal blance is the cheaper route.
    But
    Get it internally balanced. It dosn't cost much. Yu'll get a better engine. I would not even think of building a stroked engine without having it balanced.
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Building a 383 using 6" rods puts the wrist pin into the oil ring and isn't recommended on a daily driver for longevity purposes. Internally balancing the engine could also cost as little as $125.00 to as much as several hundred dollars depending on how much mallory weight is needed. If internally balancing an engine the mallory weight needs to be installed front to rear in the crank and not just boring a hole into a counterweight and then welding in, the latter method may cause the weight to grenade out at higher RPM's.
     

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