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BB motor mounts

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MNorby, Jan 10, 2002.

  1. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I may be putting a 454 in where the dead 305 not rests next week. What change need to be done for the BB swap? It will be mated to a 700R4 trans and I currently have a 3 core radiator

    '86 GMC shortbox 3/4 ton
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  2. prjt_blzr

    prjt_blzr 1/2 ton status

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    The BB won't be mated to the factory 700R4 for long. The BB will rip up a factory 700. If you keep your foot out of the 4BBL it may live for a while though.

    The exhaust pipes will need to be tweeked to fit. Your 3 core rad will be marginal if you have A/C or drive in hot weather. You may want to consider a high flow water pump like the edelbrock or stewart components to help the cooling. Most BBs want to run hot at idle due to low air and coolant flow. Also, you will want all of the accy mounts for the BB as most of the SB stuff will not fit. Add oil and enjoy the BB club!!
     
  3. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    My 700 is only 2 years old and was beefed to '88 standards when it was rebuilt. I also have a 4 speed out os a 3/4 ton 2 wheel drive that might work if I blow the 700 up. As soon as I get teh motor in I'll gets some headers and get a real exhaust on the truck too.

    '86 GMC shortbox 3/4 ton
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  4. HarryH3

    HarryH3 1 ton status Author

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    IIRC, the 4speed from the 2WD truck won't work in a 4WD application. They're totally different beasts. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  5. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    dangit! I was afraid of that regarding the tranny

    '86 GMC shortbox 3/4 ton
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  6. prjt_blzr

    prjt_blzr 1/2 ton status

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    Yeah, what Harry said about the 2WD and 4WD.

    If you're going to run the 700 then run the largest stacked plate cooler you can get. I would also add a spin on external filter and a deeper trans pan to keep it cool.
    Good Luck!!
    Mike
     
  7. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I currently have a smalle trans cooler in front of my radiator. I'm sure I could find a larger one if need be. I plan on getting a aux filter for her too with a trans temp gauge also. I think in JC whitney for $70 you can get a dual aux filter setup w/ gauge I might pickup. Do you know where I can find a deeper pan for the 700?

    '86 GMC shortbox 3/4 ton
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  8. mpascino

    mpascino 1/2 ton status

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    reguarding your motor mounts. The small block mounts wil fit on the big block. The only thing is small block mounts are not as beefy as the big block, but I have yet to come across a set of stock BBC motor mounts that will bolt to a blazer without mods......
    Good luck,
    Mike

    The jeep eater ......[​IMG]
     
  9. prjt_blzr

    prjt_blzr 1/2 ton status

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    Summit racing, Jegs and JC Whitney sell them. They are made by B&amp;M, TCI and a bunch of others. Some folks have also had good luck with the local parts stores having a less expensive brand. You should find one with about a 28,000GVW rating for max cooling.
     

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