Frank50,

What literature are you referring too?

There is a “logic” to your statement (Korean War need for some metals), but I have never seen this stated in any GM document.

Gerry,

In addition to John’s excellent Tech Tip, here is another link to 1951 Chevrolet truck information:
http://www.1954advance-design.com/A-D_LCVA/LCVA-7-51.html