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Swapping Engines

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TexasT, Apr 21, 2003.

  1. TexasT

    TexasT Registered Member

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    Well, I'm having difficulty locating a suitable 454, but have located a small block 400. Is it difficult to swap one of these in? Any pitfalls I should be aware of? Will this engine reap any fuel economy benefits over the big block? How much towing power might I expect to loose? Just a thought as the new aquisition needs to be back on the street. Thanks.

    Rich
     
  2. bad andy

    bad andy 1/2 ton status

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    the 400 c.i. is a big block. what do you plan on towing?
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    Actually 400s are smallblocks, you could get a 402 BBC in the late 60's-early 70's pickups but it was just a rebadged 396...
     
  4. TexasT

    TexasT Registered Member

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    Other thread

    Scroll down and there arre some links to pix of my trailer.
    The small block 400 I found has a crank that has been cut 10/10. Any thoughts on how this might affect longevity/reliability or if it will weaken the crank significantly. Thanks.

    Rich
     
  5. monte0172

    monte0172 1/2 ton status

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    Wont hurt it a bit. I wouldnt go more that 20 20 though if it needs to be turned again. I have seen people use 30 30 but i dont reccommend it.
     

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