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Engine Swap? What would I need?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by renny, Aug 27, 2004.

  1. renny

    renny Registered Member

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    Location:
    Salem, Oregon
    I currently have a 1985 4x4 K5 Blazer with atired 305 small block and a 700r4 tranny. What would I need to swap a 400 SBC from a 1977 Blazer with a TH350 into my truck? I only want to swap the engine. Are the flexplates different? would it be a straight bolt on to my tranny?
    Thanks in advance for the help.
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the flexplates are different only that the 400 has a wieght and the 305 does not. do not use the 305 flexplate on the 400, it will kill the motor. but they will bolt straight up to your tranny.
     
  3. GRAYTEXK5

    GRAYTEXK5 1/2 ton status

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    you're probably going to anyway, but just in case...make sure you use the harmonic balancer for the 400 too.
     

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