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IIRC they're 5/8" ID but not sure of length.
 

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One of them is 3/4 on one end, 5/8ths on the other, and one is 5/8s on both ends. I don't remember how it all works out, I had to deal with that when I did my PI intake swap and using a method to retain the cold water fan block.

The short piece between the water pump and the coolant tube is 5/8s, and it looks like it is 5/8s off the coolant tube towards the heater core, and the nipple off the back of the intake is 5/8s, so I think of one the heater cores tubes is 3/4.
 

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Bangster is right on; although the computer at advanced says the 3/4 is 23/32, lol. (24/32 is 3/4, for the fractionally impaired...)
 
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