There is a spacer under the 660 thermo housing that the other hose appears to be clamped to. I've seen those on older buses to supply water to heaters in the passenger compartment, but that certainly wouldn't apply here, UNLESS the intake was swapped at some point too ??
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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