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I finally got around to removing that vacuum canister. I haven't even touched the Vette in a few months, as some of you may notice I haven't posted here in a while. Anyways, what a pain in the *** it was to get that thing out...
The only thing that concerned me was that the front end seemed to droop after I removed the canister. So much that the fenders touch the front of the tires if I turn the wheel all the way to one direction. I'm assuming that this is because I haven't bolted the bumper to frame support brackets back yet. (I had to unbolt them to get at the canister) But just to verify, the canister is not a critical part of the frame or anything like that is it?
the center of the nose is supported by that front bracket there, I think most of the guys that take that off make some custom pieces to reinforce that area. Most of the weight is carried by those side frame extensions though, so as long as those are still there it shouldn't be having any tire clearance issues.
I just did this. Check it out here: http://forums.corvetteforum.com/show....php?t=1510906
The easiest way for me to support the front end was to remove the brackets from the air reservoir, and use them to tie the radiator support to the front bumper with the original brackets. That plus the frame extension brackets supported the front end real nice. I can sit on my front bumper and the only give is thru the suspension. Be sure to support the front end up into it's original position when attaching all the brackets, or your lower radiator hose outlet will rub against your front sway bar.
I agree 100%. When I replaced my vacuum tank, I put wood blocks under the nose until I could get the new one in, otherwise it sagged about 4 inches. It was only a matter of time before I would have cracked the fiberglass on the fenders. Luckily I caught what was going on before bad things happened.
If not supporting the bottom of the radiator support to the frame,
you will soon start to develop cracks at the front corners of the
fenders ... followed closely by the bumper cover tearing.
The radiator support holds up the fenders ... bolted to inner fenders and frame (vias giant vacuum tube).
If totally removed, you need to fabricate a support.
Relying on the two bumper bolts at the corners will not cut it.
I had the torn bumper cover and cracked fenders ... from it just sitting unsupported.
My front end is tied to the radiator support/frame in four places. The frame on both sides, and the two big brackets that tie the radiator support to the front end. Take a look at this picture. Only one of the brackets are in place in this photo. I removed the bolt brackets from the air tank, and used them to replace both of the massive middle brackets. The brackets are attached to the lower radiator support in the rear, and the bumper in the front. I am very satisfied with the support. I may not survive a 5mph impact unscratched anymore though.
But just to verify, the canister is not a critical part of the frame or anything like that is it?
in the future, if you are going to make modifications to your car and the structure support than it would benefit you greatly to ask this important question BEFORE you take the action.........
I just removed the tank from my 77. I didn't seem to have any problems. I did support the nose during removal. After I got it out just bolted the bumper brackets back on to the frame. No drooping no drama. The front end is solid and the radiator is just as it was before the removal.