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Are the cooling bypass fitting threads on a LD4B intake 3/4" NPT or 3/8" NPT?

Gotta replace the water pump and it's been about 20 years since I installed the vicous fan. My problem is I can't figure out how to remove the fan before removing the water pump. As you can see in the pics, I've removed the 4 bolts which hold the fan to the clutch and also the four bolts which...