Re: Lower radiator hose size both ends 1.75"?
OE design lower hose is stepped up at the water pump.
Two inch diameter and 1 3/4 inch diameter at the rad tank outlet.
Reason for water pump connection leaking could be severe deep rust pits and not enough hose 'softness' to seal the pits.
You might move the hose clamp up to and beside the barb of the pump inlet allowing the clamp to seal the hose about the barb rather than the flat stem of the inlet.
Applying Permatex #2 or gasket shellac/sealer to the inside of the hose doesn't hurt either.
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