"Does anyone have an opinion on frame boxing?"
Red, from what I've seen in almost 66 years of life everyone has an opinion. In the case of frame boxing, what value does an opinion have unless it is the opinion of an automotive engineer or an experienced fabricator?
I have a restored '36 Chevy pickup that I drove for about 50,000 miles as a rat rod in the mid to late 60s before I restored it. As a rat rod is had a mildly hopped up Chevy 283 and a B & M Hydrostick. The rails were not boxed and I got away with that.
My present street rod is a fiberglass replica '32 Ford roadster and one of my neighbors has a nearly identical car with one difference. My rails are fully boxed and his are not boxed at all. We both got these cars about 7 years ago. Right away I noticed that when his car was standing still and he turned his steering wheel (Vega stering) the left side of his engine would move up and down. My frame did not and does not flex like that. A couple of years ago the left side of his frame cracked all the way around just behind the front cross member. I'm not enough of an expert to say whether boxing would have prevented that.
