The manufacturers of replacement aluminum radiators should be designed and made for the application and state if special mounting hardware is needed beyond stock. I found a high end aluminum rad to cure over heating issues on one of dad’s 58 Chevys with a 327 and it did state to just use the stock mounting hardware. No issues in 8 years.
And as others have said, if it’s too loose it can also cause destructible vibrations.
Chip
'Rusto-Mod'
'51 Chevy 3600 5 window | C4 Corvette front/rear suspension & drivetrain | everything else looks old and stock
'92 GMC Sonoma GT #15 of 806
'91 GMC Sonoma GT Extended cab 1 of 1
Trucks, Trucks.....and more Trucks | 
