Well, I am full of errors! I just found my notes I recorded in 2008 when I removed the radiator on the Camaro:
Tag= I0 UY
00
70 R
“10”= big block, 4 core end tank, with curved neck
“UY”= Broadcast code= COPO (big block 4 core 23 inch wide core, .16 spacing on fins) part # 3018624* Used in 1969 on manual transmission 396 air cars and 427 COPO cars only- 4 core, 23 inches wide, with .16 fin spacing.
“00”= big block manual end tank, four core only used on big block manual trans cars.
Between these two letters is the letter “F” which means it was made the month of June.
“70” and “R” are unknown characters and meaning is unknown.
The tag I found loose in my parts bin I took a photo of must have been from a Corvette from 25 years ago... but this is the actual info ion the radiator that came in it, I wrote it down when i removed and inspected it. Of course the date is off, but it led me to believe it could have been an SS instead of a Z28. But the radiator had to of been replaced with a heavier one when he raced it in the 70's...
I am guessing the radiator might still be in the barn where we stored some of the parts off the car...and the tag might still be on it.
Racer Dan