I've been watching this as I just got my Z last month. It's been cool here in TN thus far, so I'm waiting to see what my oil temps do this summer.
I've not seen temps go over 200 thus far in mine, but I don't drive like a pissed off teenager either.
I will be hitting the drag strip with it here soon just to see what it'll do.
If I do a cooler, I want one with the thermostatic adapter. Then I'd probably go with a 24 row. With the thermostatic in there it shouldn't open till the oil temp hits 180 and then close again if it falls below that to make sure I don't have any issues in the winter.
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