Never heard of a heavy duty heater core, but Ford did make little restrictors that you would put in the heater core inlet hose to stop the core from bursting. I think there was a TSB on it. On Mustangs either later 80's or early 90's.
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Dave
1968 Cougar
2004 Thunderbird
2007 F150 Harley-Davidson, SuperCrew
1986 LTD
1997 Ranger
1992 Honda Civic
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