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small block crank question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Rix_Gotta_Blazer, Oct 27, 2002.

  1. Rix_Gotta_Blazer

    Rix_Gotta_Blazer 1/2 ton status

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    i am in the process of rebuilding my 1984 4 bolt 350. i am curious as to weather or not you can put a 2 bolt crank and rods out of a 1972 block into the newer 1984 350. is there any problem with the 2 bolt crank into the 4 bolt block? yur input is appreciated.
     
  2. TX Mudder

    TX Mudder 1/2 ton status

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    It will be fine.
    -- Mike
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    2 bolt 4 bolt dont matter. The only difference is 1 piece rear main seal vs. 2 piece rear seal.
     
  4. Rix_Gotta_Blazer

    Rix_Gotta_Blazer 1/2 ton status

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    thank you very much. i will proceed with the rebuild.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    If you are going to be swapping crank and rods I would highly reccommend that you rebalance the engine since there is a balance difference between the early and later engines. You may get lucky and not have a problem (doubtful), but if it were me I sure would hate to have to pull the engine and tear it down and rebalance it once you have already had it built and installed.
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    I'll have EVERY engine I build from here on out balanced.

    The shop that lost my connecting rods gave me new Eagle rods, and the crank had to have a LOT of material removed to get the thing balanced right. Thats a lot of stress that can be relieved from the engine for a minimal cost, something like $125 locally for a complete balance job.
     

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