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Now go another step. The core I have installed now between my original upper and lower tanks is still a 3 core, but called an SLK core, which is comparable to an OEM 4 core GM radiator. And it's made up in Philadelphia, PA USA. This core is copper with 3/8ths inch spacing between the tubes. Yes, I measured it. I've no idea as I did not count the number of tubes in my original OEM 3 row core, but this core has 168 tubes and too many to count extra fins.
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Current parts store radiators and standard re-cores do not have sufficient tube count or fin density.
It takes a custom core like mentioned above (high-efficiency spacing, large(r) tubes) to equal OEM cooling (comparing copper-brass).
Your original OEM core will have 39 rows, with 3 tubes per row. The tubes are 1/2".
An OEM 4-row will have 156 tubes, so the SLK core 3-row has 12 more !