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On my 69 BB I installed a Edelbrock hi performance water pump #
EDL-8860.
From what I can tell by measuring the inlet diameter =1.95 inches
or 2 inch hose.
Does anyone know what the stock BB inlet hose size is.
I cant find a hose that says its 2 inch on the water pump side and I dont have a stock pump to measure.
I do not believe you need a special/different lower radiator hose for an Edelbrock water pump. I put an Edelbrock water pump on my 68 big block and the lower radiator hose fit fine. Snug and no leaks.
Did you try the stock hose and it didn't fit or are you just anticipating an issue?
Do you have a stock radiator? If so, you can go to NAPA or some other auto parts store and buy a lower radiator hose for a 69 Corvette with a big block. It should fit fine. Were you looking for something special/different? Just trying to help. :-)