1st gen camaro update and question
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93-96 has 1 3/8" core
97 has 1" core
98-02 has 7/8" core
A lot of us 98-02 guys switch to the LT1 radiator for this reason. Larger cooling capacity, and it fits directly is place of the LS1 radiator.
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SLP used to sell a "Heavy Duty" radiator for 98-02s. It was a GM 93-96 radiator with the fitting epoxied shut.
If you're not using a low coolant sensor (98 harness only), you'll have to either put a sensor in there to plug it, or do like I did and put an expansion plug in there. Everyone said my expansion plug wouldn't hold, but it's been holding, leak-free, for 14k miles.

