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Author
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Topic: Radiator Pressure/Heater Core
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bifs66
Gearhead Posts: 169
From: Maryland
Registered: Apr 2000
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posted 08-09-2002 11:02 PM
   
At 500 miles, the heater core in the Fastback gave up. I'm running a 16 lb cap (came with the Howe radiator) and was concerned that after installing a new core, it will break again. However, the leaky core was of unknown age; but looked OK and pressure tested to 15 Lbs at the time I rebuilt the heater box. Anyone have to deal with mixing early Mustang heater cores with modified/upgraded engines and cooling systems. ------------------
Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 08-10-2002 02:42 PM
I'm running a 7 lb. cap on mine  One pound of pressure = 3 more degrees of boiling point. Example: 16 lb. cap would put the boiling point at 260  ... 16x3=48, + 212. Do you intend on running your motor any where near 260?
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kcode
Gearhead Posts: 2623
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 08-10-2002 11:14 PM
Bernie,
My guess is that your heater core was due for replacement any way. I had one do the same thing but at 6000 rpm in first gear on a drag strip. I replaced it and have not had any problems since, about 4 years ago.Mike
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