Chassis mods for 70 GS

Discussion in 'Race car chassis tech' started by BrianTrick, Oct 19, 2021.

  1. BrianTrick

    BrianTrick Brian Trick

    I was originally doing this frame for my silver car,but since my white one needs 1/4’s and outer wheel houses,it would be a good opportunity to try those ABC inner tubs,so all of this is going on that car. I fabbed and welded all of the gussets and braces for the rear of the frame. I did not narrow the frame per say. If anyone has looked at a 70-72 frame,you would see the wheel arches flair out on the inner curve. I just simply made the side vertical. I also did this so I could go back to traditional coil spring if I ever choose to. If you measure across the tops of my arches,it is the exact same width as a stock frame,but I still gained over a inch. So now the inner tub would be the clearance restriction,which brings the ABC tub into the equation.
     

    Attached Files:

    70 GMuscle likes this.
  2. BrianTrick

    BrianTrick Brian Trick

    A few more pics before blast and powder-coat. I also added some clearance behind the wheel arches to help snake the bigger exhaust pipes around and out the back,and still have them tucked up away. Grind and smooth all the factory weld goobers. Again,might as well while you’re at it.
     

    Attached Files:

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  3. BrianTrick

    BrianTrick Brian Trick

    Blasted and coated. I probably won’t use the hard lines,but again,if I ever retire the car back to something else,at least they are in there. 1/2” stainless fuel that I had Inline Tube bend for me and the stock 1/4” return.
     

    Attached Files:

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  4. BrianTrick

    BrianTrick Brian Trick

    Add towers for the cage. We did a few A-body cars like this before,which made the cage install easier and yet still get approved.
     

    Attached Files:

    Kirk600 and 70 GMuscle like this.
  5. BrianTrick

    BrianTrick Brian Trick

    Now assemble it with all of the parts that I’ve been tripping over. I light be slightly out of the ordinary with some of my front suspension,but I did one of my cars about 25 years ago,and still like how it drives down the road and down the track. Hotckiss uppers,B-body spindles,12” rotors,tubular lowers,QA1 double adjustables,custom tie rods with the good lined rod ends,rebuilt manual box.
     

    Attached Files:

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  6. BrianTrick

    BrianTrick Brian Trick

    Onto the back. Started with a Moser 12-bolt housing ,Mark Williams 33-spline shafts and assembled it with a Tru Trac unit,Motive Performance 3:55 gears,Strange chromoly yoke,Timken bearings.
    Global West rear coilover kit with QA1 double-adjustables,TRZ adjustable uppers and lowers,the old style Hotchkis 1-piece frame braces,and and H&R Parts anti-roll bar.
     

    Attached Files:

    70 GMuscle and stump puller455 like this.
  7. JESUPERCAT

    JESUPERCAT No Slow Boat

    Looking good
     
  8. BrianTrick

    BrianTrick Brian Trick

    Drove the car one last time a few days ago,then apart it came. Chassis wrapped and swapped and now ready for surgery. Not bad for a weeks worth of work. Off to get 1/4’s wheel houses,and a smooth firewall.
     

    Attached Files:

    70 GMuscle, PGSS, Oldskewl59 and 2 others like this.
  9. Todd69GS

    Todd69GS Silver Level contributor

    Nice work Brian
     
  10. 12lives

    12lives Control the controllable, let the rest go

    ONE week! Wow! Looks great!
     
  11. BrianTrick

    BrianTrick Brian Trick

    Yes. I am exhausted.
     
  12. Cutlass

    Cutlass Platinum Level Contributor

    Very nice pics to look at, keep them coming :)
     
  13. PGSS

    PGSS Gold Level Contributor

    One week! WOW!
    Alot of members here just make me feel so Stupid.
    Awsome:D:cool::cool:
     
    Last edited: Oct 31, 2021
  14. fastest430

    fastest430 Well-Known Member

    You do nice work and that powder coat looks so good
     
  15. sean Buick 76

    sean Buick 76 Buick Nut

    Amazing work I like the extra room for tires while keeping very factory!
     
  16. BrianTrick

    BrianTrick Brian Trick

    I don’t really need extra room for tires,but if I’m going through all this process,might as well when you have the opportunity.
     
    70 GMuscle and sean Buick 76 like this.
  17. sean Buick 76

    sean Buick 76 Buick Nut

    So is there a new engine build as well? Just curious on the motivation for re doing an already nice appearing car. Did you need the chassis upgrades for safety for a race class?

    Or maybe I’m miss understanding and the car isn’t being re painted?

    Awesome project! I would love to do the same idea with my car using another chassis to swap under the car and do a full cage so I can go faster than the 10.00 I’m now limited to.
     
  18. hugger

    hugger Well-Known Member

    You gonna run 2.125 or 2in headers?
     
  19. BrianTrick

    BrianTrick Brian Trick

    Sean,
    I was originally going to put all of this under my silver car,and I still might build another chassis like this for that car. My white car was all together,running & driving. Very presentable,but to go any further with it,it really needs taken back apart and done over. The worst part about the whole car is the outer wheelhouses. They have holes,which have now caused bubbles on the lower 1/4’s. I don’t do patches. By the time you mess around with fabbing and fitting patches,you can have the whole 1/4 cut off and fitting another one. Having the 1/4 off,then the outer off,this gives the best opportunity to do the inner tubs,so I figured why not. I will end up putting the engine that was planned for the silver car into this chassis/car. It’s the 517” with the Frankenstein Stage2 heads.
    Hugger,
    I have the 2 1/8” headers,but at some point I will have custom headers made with a step and a merge collector. Nothing wrong with the production headers,but I have always made even more power with a custom header,and then more yet with a merge collector. It all adds up in the end.
     
  20. hugger

    hugger Well-Known Member

    I was just gonna say those 2.125 headers are INCREDIBLY TIGHT,.....hits the frame in a couple places,.....
     

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