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Re: Can a heater core be installed updise down? Effects?
I may be wrong but my understanding is the hoses are different sizes to make it unlikely they would be switched during manufacturing. The idea is to have the inlet on the bottom and the outlet on the top to allow the air to vent out of the core and not get trapped.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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