Engine SwapEverything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.
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You'll likely be fine with the stock radiator, provided it and the rest of your cooling system is in good shape (and your new motor runs a good state of tune). So...
Yes/No
__________________ "A man who voluntarily drives a car like that and still manages to maintain such impervious confidence that it will faithfully start the next time he turns that key is an encouragement for us all to take greater risks in life."
The factory used the same radiator for the 305 and 350, and even the 3.1 V6. It doesn't "need" to be upgraded. But, it won't hurt anything except your wallet to do so.