I have the C&R radiator and have been advised by them and others to use some rubber. Here is an email they sent me on the topic:
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What you don’t want to happen is the radiator to become a weight bearing structural part of the car. Hard bolting it in would make the radiator flex with the car and allow no place for the radiator to expand/contract as it heats and cools. These issues will shorten the life of the radiator and lead to tubes breaking away from the header sheet and you get a leak that is hard to repair. Rubber grommet mounts are one method to give the radiator a way to expand. We use pin mounts with grommets on some radiators but if yours bolts directly to the core support, you can HARD bolt one side but on the other either OVER SIZE the holes you’re bolting through, SLOT them to allow for expansion or use a rubber grommet. All will allow the radiator to move as it needs to. If you have any further questions give me a shout.
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2004 NASA AIX Mustang LS2 #14
1964 Lincoln Continental
2014 4 tap Keezer
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