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Balance holes drilled in a 350 flywheel?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mountainexplorer, Jun 22, 2003.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    I have a flywheel that I pulled off a 454. I had assumed that it was a 350 flywheel, since they swapped in the 454 replacing a 350, and they had used a balance plate that was bolted between the flywheel and crank.

    I just had that flywheel re-surfaced to use on a 350, and I noticed 4 balancing holes drilled on the front of it. (left flywheel, bottom left of pic)
    [​IMG]

    Did some 350 flywheels have balance holes drilled in them like this? (the flywheel on the right of the picture is a 350 flywheel for sure).
     
  2. Lonnie

    Lonnie 1/2 ton status

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    Those holes are drilled for balance.... they are only to neutral balance the flywheel. This is required due to some casting irregularities. A non-counterweighted flywheel would likely require more drilling than possible to make it compatible with a 454. In these applications (400, 454 & late model 1pc. seal engines)you require weight to be added not subracted.
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    Thanks for the input. Now I'll feel a bit more comfortable using it on the 350, instead of wondering if someone had balanced it otherwise.
     

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