1976 Chevy hood hinges and springs

[firefighter]

I have a quick question about our early generation hood hinges and springs.

After I rebuilt my truck the last time, the drivers side rear of the hood always seemed to vibrate up about 1/4" while driving, so I was forever pushing it down with my elbow when I got out. (I know.... some of the strange habits we get used to when we should have just fixed it)

Before putting the hood on this time, I've lubricated the hinge pivots and fixed a couple loose hinge joints.
My main questions is:
Can weak hinge springs allow the hood to raise up in the back? I mean the springs always kept the hood up, but are they also designed to keep the hood DOWN?
I don't really want to fight with this again for the next 15 years.   

Thanks guys.

[bake74]

     I would imagine they could.  When fully closed the hood hinge spring assy. does sink down and go past the middle point just a little to put downward pressure on the assy. to keep it closed.  If that makes sense to you.

[jaredts]

I don't know from experience, but I've seen a similar question asked on here a lot.  I think the typical advice is get new hinges.
--edit, here's one from just a few days ago:  http://forum.73-87chevytrucks.com/smforum/index.php/topic,23253.0.html

[Jason S]

Springs can get weak.  I personally like this thread about repairing the hood hinge. It doesn't address the springs, but it looks like a pretty slick fix for worn pivots.

http://forum.73-87chevytrucks.com/smforum/index.php/topic,1945.msg8363.html#msg8363

[bake74]

     I have never looked for replacement hinges, they can not be that hard to find.  I will have to remember to look up how much they cost, just for curiosity sake.

[firefighter]

I had read the articles with the suggestions about replacing hinges but didn't see to much about the springs.

I did have a couple loose rivets on the drivers side (the side that kept raising) so I tack welded them back tight.
The springs came off the hinges pretty easily but yet they still held up the hood no problem. I do have another truck where the hood doesn't raise as you drive the truck, so I think I'll do a little experimenting by doing some parts swaping.

Thanks for the comments and suggestions guys.
I know many of these questions are redundant so I appreciate you all taking your time to reply multiple times.