Originally Posted by Pre '68 Dave
Just a FYI, Chevrolet stopped using pal nuts when they went to full pressure engines.
I have a '53 W/Powerglide 235 (Chevrolet's first full pressure engine) which has pal nuts. (A little off topic since it is not a truck engine. Just thought that I would share some trivia since a lot of car engines end up in trucks.)

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission