Bending heater core tubes

CRUZE 418 said

Be careful trying to bend those tubes for alignment, it cost me a trip to the radiator shop.

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Save yourself an emergency trip and just take it to the shop and let them bend them if they are off a lot. Are you sure you got the right core? Same as the one that came out? Bring both (original and new) and for like $25 they can fix you up.