You know, that might solve the mystery. They are certainly not plugged with a fitting but they could have been welded up and ground smooth during some prior radiator work. They did a good job if that’s what was done.
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Bill
Central Indiana
1959 Corvette
1968 Z/28 RS
1969 Chevelle SS 300 Deluxe Hardtop
1977 Ferrari 308 Supercharged
1986 Crewcab Dually w/ 88 40' Chaparral
2008 Z06 Corvette
NCRS #1030
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