My GMC radiator had the relief valve. I didn't trust it and when I had a new core installed, I had it removed. They also mounted a nice copper drain tube down the side for me. I use a 7 lb cap right now but I really should put a 4 lb one in.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!