MALIBU Cold case. Splitting again

[Dezimade]

Had to think a bit after re reading your original post. Your 79 Malibu Classic with the 267 (4.4 Litre) more than likely had the standard cooling radiator which would have been a single pass. My current 79 Monte Carlo with the 267 was set up this way. Thick tank on the passenger side thinner width tank on the driver side. Most welded aluminum radiators come with thick tanks on both sides. If the rubber insulator that holds the radiator to the core support was not modified (I had to open up both sides top and bottom for my Liland Global aluminum radiator to fit without force ) the top plate may be adding downward force on the rank and end plate cracking it. Is this radiator leaking on the same side as the first? Is it the driver side?

Note the rust. Look closely

Out of shear curiosity...Are the electric fans mounted to the radiator with a bracket set up or just "Zip tied" through the core? I ran an electric fan set in in my first 79 Monte Carlo with a copper/brass radiator I had purchased through a company I was working for. One of the engineers recommended attaching the fans (Flex O Lite) to the steel cross brace at the top and bottom of the radiator with the supplied brackets from Flex O Lite and use a small rubber insulator at the attachment points to keep the harmonic vibrations of the fans from destroying the braze and solder points of the tanks.
I'm wondering if the harmonic vibrations of the fans is splitting the seams.e second

Also I forgot!! This is the third. Not the second.