Back in sbc days, pre LS, the smaller hose was the inlet for the heater core, and the larger hose was the outlet for the heater core. Always figured the hoses were different sizes to keep people from connecting wrong hose in inlet/outlet.
Now as for the LS water pump, I'm totally unsure which is which, but would hope that GM kept the hose sizing, larger vs. smaller, the same, meaning small hose is heater core in, larger hose is heater core out.
So basically, I didn't help you out one bit...LOL
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