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454 swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dumbfounded, Aug 9, 2000.

  1. dumbfounded

    dumbfounded 1/2 ton status

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    Since I saw a couple of posts on 454's. Was wondering what was involved in a swap on a 78. Headers, THE MOTOR (of course), what else? Motor mounts? Any headaches you all have encountered?

    Love, Peace, and Hair Grease...........
     
  2. bablazer73

    bablazer73 1/2 ton status

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    headers and all pulley's make it easy. the mounts are the same. pulleys and p/s brackets are different.

    your right. I don't understand the jeep thing!
     
  3. Shawn

    Shawn 1/2 ton status Premium Member Author

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    A larger radiator is needed. Usually a 750+cfm carb is also needed.




    Shawn
    87 K5
    few mods
    [​IMG]
     
  4. LittlePig

    LittlePig 1/2 ton status

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    Remember the 454 is externally balanced, so make sure you get the flexplate/flywheel that goes with the engine, since your 350's flexplate/flywheel is for an internally balanced engine. You will need different motor mounts. Also, you should get a bigger radiator, since the bigblock puts out a bunch of heat. Just a quick aside, before you put in the big block, look into getting a kit (don't remember who it was made by) that brings extra oil up to the cam, as big block Chevys are known for under-oiling and thus ruining cams.
     
  5. BlazerGuy

    BlazerGuy 3/4 ton status

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    BC Engineering makes the overhead oiler kit.

    YEEEEE HAWWWWW[​IMG]
     
  6. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Have a # for BC engineering? Funny, I just posted this question on ORC and the mail list.


    Shawn
    87 K5
    few mods
    [​IMG]
     
  7. BlazerGuy

    BlazerGuy 3/4 ton status

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    I couldn't find the number. I think it's in a 4Wheel & off-road magazine. I saw it in an article about 73-87 truck buildups.

    YEEEEE HAWWWWW[​IMG]
     
  8. LittlePig

    LittlePig 1/2 ton status

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    I have that magazine,it has some good tips for doing block swaps. There is an article earlier in the magazine that talks about what you need to swap in a big block, along with stuff about transmissions and tcases too.
     
  9. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Thanks for trying. I'll look through my 5yr magazine stash and see if I can find it. Tried a search on a couple search engines and found nothing. BTW- It's not BC Engineering in AZ. I called them and they didn't know what I was talking about...



    Shawn
    87 K5
    few mods
    [​IMG]
     
  10. LittlePig

    LittlePig 1/2 ton status

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    Here is the number and address for BC Engineering:
    148 S 17th st.
    Grand Junction CO, 81501
    970-243-5438

    Email: xiaozhu@my-deja.com
    ICQ: 84108805
     
  11. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Thanks Little Pig!

    Just called and left a message with Bob.

    Shawn
    87 K5
    few mods
    [​IMG]
     
  12. TheBlazerKid

    TheBlazerKid 1/2 ton status

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    Dont know if this applys to all blazers but I know on my 71 we had to hammer the firewall in a bit to clear the drivers side valve cover

    Your right I dont understand the jeep thing!?
     
  13. Shawn

    Shawn 1/2 ton status Premium Member Author

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    My 87 had no clearance problems with the big block. Even with the tall valve covers, it cleared the booster and the large HEI doesn't hit the firewall. I would assume that would cover 73-91 bodies.

    Shawn
    87 K5
    few mods
    [​IMG]
     

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