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ATTN BBC AND AutoTrans Folks

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, May 21, 2001.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I have a TH350 trans, a NP205, and a 454...

    My Problem you ask? I have a torque converter that (after I installed the trans and transfer case) I found will not bolt up to the engine's flywheel. It measures 10" from one bolt hole to the next.

    I have another TQ that measures 11" bolt-hole to bolt-hole, just like the 454's flywheel. This TQ is from a TH400 with an Oldsmobile bell-housing. My understanding is that TH350 and TH400s use the same type of TQ? I want to make sure that this thing will work before I tear everything down just to put the TQ in and find out it won't work. But, if they are the same, why the different bolt pattern???

    All I have left to make my truck streetable (after 3 months solid work...)
    * Trans lines
    * Front and Rear driveshafts (suggestions???)
    * Ignition system (Mallory Unilite distributor needs install)
    * Belts

    I hope that June 8th the funds will come to finish the project. Then I still need rims and tires. Driveshaft FYI...

    rear diff= 14BFF
    front diff= 8-lug 10 bolt

    Thanks again guys! Steve, this place is the BEST! Thanks for answering questions that no place around here can touch!

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     
  2. ken

    ken 1/2 ton status

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    The 400 converter will fit right into a TH350, I ran one like that for years. Also, alot of 454 flexplates have a dual bolt pattern, to where it will accept either the 11" version converter or the 10". Rotate your flywheel to the next set of bolt holes and see if that 10"er won't bolt up. My 454 flexplate has the dual pattern.

    ken
     
  3. bablazer73

    bablazer73 1/2 ton status

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    GM used 2 different bolt spreads for the converters. If your flexpate is not set up for both patterns you will either have to get a new flexplate or a new coverter. If you are going to replace the flexplate, I would Highly recommend getting A thicker race type flexplate. The stock flexplates are thin and will crack under the strain of a mild bigblock. A good T.C.I. or other flexplates are available for 60-70 bucks. Change it once and never agian! I cracked one in a truck before. Ain't no fun to change!

    your right. I don't understand the jeep thing!
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    You bring up a great point about shredding a flywheel... my last P/U with an EFI 350 and a stage II shift kit ripped the old one off the crank right after the bolts! What made me think I could use a stock plate on this 454? And its not mild, we can leave it at that... Compition Cam .524 lift, Edelbrock Air-Gap intake, headers, Holley 750CFM, etc etc etc...

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     
  5. bablazer73

    bablazer73 1/2 ton status

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    I just completed my new 454. 9.25 comp. comp cams hydraulic roller, roller rockers. Holley projection. and your damb sure I used a New T.C.I. flexplate!!

    your right. I don't understand the jeep thing!
     
  6. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Very nice setup! Did you have the engine dyno'ed? That must be a motor with alot of kick!!! Did you base it on a rectangle, oval, or peanut block? Mine is a oval... but I did not use any roller parts... YET! So far, I have spent $3500 rolling chassis and drivetrain (the drivetrain came seperated from the truck...) and about another $2200 in parts to make this damn thing go (AND IT STILL HASN"T RUN YET)... and now I need new driveshafts; another $450+ And then there is still the small matter of getting bigger tires put on there...

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     
  7. bablazer73

    bablazer73 1/2 ton status

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    here is a pic of the shortblock. I am going to try and run the peanut port heads. I am going for as much "reliable" torque as possable under 5,000 rpm. If the heads don't work, I plan on useing a set of GM signiture aluminum oval ports.
    [​IMG]
    no dyno testing but I expect 900hp! lol. I am looking for 450-500 hp. and 600-625 ft torque by 3,800rpm. This is less than Comp cams told me I should get. I just hope it's enough!! I also have MSD box and a ton of other stuff. I figure I have almost 4,000 into engine alone. I am not afraid to throw some nitrous into it. If needed.

    your right. I don't understand the jeep thing!
     
  8. blazbrnc

    blazbrnc 1/2 ton status

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    If he swaps in a new flexplate doesn't it need to be balanced with the crank and dampener since the big block is externally balanced?
     
  9. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Here's a shot of mine in the truck...
    [​IMG]
    Isn't that just beautiful? I should keep a copy of that pic under my pillow!

    Here is what I need BaBlazer... if you can help drop me another message or an email...

    Like I said, I need the front (stock driveshaft) and a rear driveshaft adapted for the 14BFF axle. I need wheels and tires (35-38") on 16.5" or 16" rims... what else... I'll add more later...

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     
  10. bablazer73

    bablazer73 1/2 ton status

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    looks awesome! I think you should always keep a photo under your pillow. sweet dreams!

    your right. I don't understand the jeep thing!
     
  11. bablazer73

    bablazer73 1/2 ton status

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    If you buy a flexplate for a 454, it already comes to "detroit" specs with the new counterweight attached. If your engine has been rebalanced, it should be balanced to the new specs.

    your right. I don't understand the jeep thing!
     
  12. ken

    ken 1/2 ton status

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    The peanut ports work great. I switched out a set of oval ports to peanut ports on my 454 and noticed a nice improvement in torque down low, faster off the line, etc. Do a bit of mild porting work (clean up the slag, etc.) and they will come alive.

    ken
     

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