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Help with 454 Install trouble! Torque Converter/flexplate

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer79, Nov 18, 2001.

  1. Blazer79

    Blazer79 1/2 ton status

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    Well, today I continued with the installation of the 454. After finally aligning it properly and starting the bellhousing bolts now I realize that the torque converter holes don't align with the flexplate. It seems the torque converter holes are about 1/2" smaller pattern. Does this sound right? Are there different bolt patterns? If so, how much does each pattern measure? Or is the tranny not properly aligned yet?

    Thanks.

    <font color=purple>//////
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    Soon a 454 K5!!</font color=black>
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  2. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Mine dd the same thing. I had to acquire the correct torque converter for my flywheel. Most flywheels have two patterns, but some of us are lucky enough to only have one pattern. Sorry if that info isn't what you wanted to hear, but it's the truth!

    Good luck with the rest of the install! [​IMG]

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
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    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    If you notice a lot of places like Summit Racing or Jegs selling the aftermarket flywheels, such as TCI or whatever, they always advertise them as "dual bolt pattern".
    Most of these aftermarket flywheels already have the bolt patterns for BOTH the large and small patterns. This takes the guess work out of trying to decide which to get.

    If its not too much trouble, would you be willing to pull the tranny back out again to install a new flywheel?


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

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  4. Blazer79

    Blazer79 1/2 ton status

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    Thanks for your responses.

    I ended up installing the torque converter that came with the 454. The problem is I don't know its condition (mine was perfect[​IMG]). Before installing it, I spent about an hour trying to empty the ATF which looked more like a chocolate milk shake than anything else.

    I pulled out the engine instead of dropping the tranny because the cherrypicker was already in place. To be honest it wasn't easy and I was a bit upset since I had such a hard time aligning the engine to bolt the body mounts the first time. Now I had to do that again, except it's always easier the second time.

    Now the good news is that the 2wd Thorley headers that came with the 454 apparently fit [​IMG]. I have to move back the exhaust pipes to test them properly and be sure, but hopefully they will.

    Let's see what pops up next weekend when I start with the manifold, acc brackets and all the little stuff.

    Thanks again.

    <font color=purple>//////
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    Soon a 454 K5!!</font color=black>
    [​IMG]
     
  5. Sparky87k5

    Sparky87k5 1/2 ton status

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    Know the feeling well. I'm in process of installing a 427 I bought and still trying to find all correct brackets and pulleys for everything. Hard part is finding info about what to get and how everything bolts together, especially the A/C system. But, we both know, the BB power will be reward enough for all the effort.

    87 K5, 427BBC,D60 & 14BFF, NV4500, NP208, TSM disc's,
     
  6. Blazer79

    Blazer79 1/2 ton status

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    Ahh, brackets. it ends up being harder to figure out than removing, rebuilding and reinstalling the engine.

    There should be a company out there that sells the brackets for a reasonable price (March not included) with a nice website and diagrams.

    In my case I've got the A/C brackets complete, but I'm missing the one that goes under the PS pump and the Alt. The Alt is no prob. I can get a cheap chrome one from PAW, but for the PS, I'll have to go junkyard hunting.

    I too, believe it is worth all the hassle in the end. I can't wait to feel the neckbreaking power of my 454.

    <font color=purple>//////
    <a target="_blank" href=http://blazer79.freeyellow.com>blazer79.freeyellow.com</a></font color=purple><font color=black>
    Soon a 454 K5!!</font color=black>
    [​IMG]
     

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