1970 Buick GS 455 frame questions - HELP!

Hello everyone. I need help with a frame repair
I purchased a 1970 Buick GS455 numbers matching car to do a frame off resto.
I finally got to the point where the engine and tranny came out yesterday and I noticed this!
See pictures.
I am definitely not an expert on Buick/GM frames but I seriously doubt this is the way it came from the factory. The frame mounts look to be welded in place and are non-symmetrical
Can anyone look at this and explain what happened here?
When I bought the car it ran and drove smooth and straight and quiet
I guess I am wondering why one mount would be crooked. You would think that the parts that mount to the block are symmetrical. Does this mean that the frame was altered? Maybe came from another Buick or Pontiac or something?
Also how do I fix this? I can't just reposition them as the driveline will not match up anymore. Finally....how did the driveline line up anyway with these mounts like this!!!!
Need help
Thanks

 

Check the frame code. Drivers side outside frame rail behind rear tire. Close to the exhaust hanger. Get a wire brush and clean the area. Tell us what you find.
John

 

The 2 frame mounts will be offset.

They are welded because the bolts are a royal PITA to install or tighten with the lower control arms attached.

 

I would grind the welds off,make sure the 3 bolts are tight in each mount(they are mounted correctly by the way) and move forward.Unless You want to remove them,then it's easier to remove the bolts with the car off the frame and with the coil springs removed, so you can get to the bolts.A couple extensions and a swivel or 9/16 swivel socket will get you back to where you need to be..

 

See picture. This is where I looked for markings. Is this correct? I mean I scraped and scrubbed and looked under magnification and I do not see anything in this location. Is there some other place to look?

 

Look left rear rail on the side not the top
Good luck
Alain

 

I do not see ANY markings there.....none! So if there are no markings there what does that mean? This is not a GS455 frame? Where else can I look for markings that can tell me where this frame came from?

 

Rob,

Read this: http://www.buickperformanceclub.com/FrameNumbers.htm .

 

Too pitted see probably judging by the top of the frame, ...and no that isn't a big block frame big block frames have 3holes in the front cross member. All Fremont cars ive ran across also have the 3 hole cross member no matter the engine.

I have a clean 70 455 frame if your need and want to come to SC

 

I kinda thought something was wrong seeing the mounts welded in. The original frame was probably too rusted to save so he found a non-GS frame and fit the big block in there. So HUGGER how much for the frame? I can arrange to have it picked up. Is it TRULY a GS455 frame? Can you send pics of the markings? Is it rust free?

 

Are you going for a judged car? If not, try and get a convertible frame. That c channel frame is about as stiff as a rubber band.

 

Well either way I now need a GS 455 big block frame. Does anyone know of anybody who has one for sale? Looking for one with all the correct markings to go with my car.

 

There are only 2 frames for 70 GM 2 door A bodies. The standard c channel frame and the boxed convertible frames. Only differences are how the crossmembers are drilled for the motor mounts.

 

I put convertible frames under my cars,and I am currently building one to put under my GS hardtop. I will have the whole original rolling hardtop frame available soon. It has the factory BB mounts,disc brakes,boxed rear control arms,sway bar,frame braces.
The engine crossmembers are the same on ALL frames. They have multiple holes for all of the engine makes/sizes.

 

I have a guy from Ohio who has several frames for sale. I need to know what would be all the stamps and numbers required for a 1970 Gs455 frame. I want to buy the right one. Can someone tell me the correct frame codes for my car?

 

"BW" iirc, it's in the assembly manual

 

Unless it is an early car. Then it would have a different frame code, so it all depends on when your car was built.

I believe that is also called out in the assembly manual.
Duane

 

Mine is under a 70 GS,and it was built January/1970.

 

I had sent away for the Sloane Museum info and the pages they sent back say the invoice for the building of the car was September 18th. I would have to assume this is 1969. I doubt they would be still building 1970s that late in 1970! Also the second page showing the the build order has a little red stamp at the bottom saying "NOV 1969" VIN is 446370G102462. I think it was built early in production. Does this help with choosing frame replacement?