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Just a quick "B body" question....

cudabee

cudabee

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....this is probably a silly question, but today as I was scraping several sq. ft. of thick Mopar undercoating off of my projects floorpans, I was cussing the numerous plug holes. Then it struck me, what are all these holes for? Many times, for one reason or another, I've found myself scraping, sanding, painting, etc. around these holes of various sizes. Just wondering if they truly have a purpose, because if it's to prevent water problems, rust, etc. IMHO they don't work. All info appreciated.
 
That is right. AS the cars went down the line, when in bare form, the structures were suspended from above and dipped into large containers of chemicals to resist rust and corrosion. As they were lifted out, the holes in the floor allowed the liquid to drain out. The rubber plugs were used to seal out the elements when the car was driven on the road.
 
Could be wrong here, but also as locating holes for the assembly process of the unibody. The line guys out here would know if I'm correct.
 
gdrill said:
Drain holes from the dipping process I believe.
Click to expand...
66Satellite47 said:
Could be wrong here, but also as locating holes for the assembly process of the unibody. The line guys out here would know if I'm correct.
Click to expand...
you-are-correct-sir.jpg
 
So the insides of your frame rails were coated?
Out of the over 50 bodies that I have drilled out and dismantled none of the 66-74 frames were coated on the inside. All of the 62-65 frames were coated. One reason why I have sold 10 times of the 66-74 frames than the 62-65 ones. The 62-65 frames just don't rust out like the later ones.

20160519_091216.jpg
 
You have a good point HOWEVER the dip line is clearly visible on my '69. Also, all that bubbly crap that's in all the beads in the floor and trunk is dried up "dip" that was unable to drain before paint.
 
I thought the same until I started pulling floor pans. Why are the 66-74 frames a bit rusty inside and the 62-65 frames are not. The earlier frames have a gray coating and the later ones are bare metal. Just what I have found. All my stuff is from the SW desert.
 
If I think of it today I'll post some pics of the inside of my '69 frame - grey coating. They still rusted but there is no perfect coating and mine was subjected to northern winters with salted roads. The salt will do in anything !!
 
Glad I'm not the only one that thought dipping was done into the '70's. But again what the heck do I know. Pretty sure I saw video of Chrysler cars being dipped in 1970. But could be wrong.
 
There are drain holes and locating holes. The ones on the “frame” double up for both. All others are for draining after it gets dipped.
The locating/drain holes are for sitting on a carrier.
Pretty sure it’s the same process we use today but just a little more technical.
If you have dip lines then you probably have a vehicle that was partially submerged and sat in the tank for a while before it indexed out.
 
Chrylser had a multi stage dipping process........the only half dip portion was the "dip primer" stage which gave the classic dip lines.......

Their was an old articlethat laid out the stages nicely....I have it stored so mewher, lol.....
 
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