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 Restrictor for heater core
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Tribal Scout

6 Posts

Posted - 30 Aug 2010 :  8:05:13 PM  Show Profile  Reply with Quote
Hi all- I have seen this subject before but I quess I am to thick headed to understand this. I have been led to believe that some type of restiction is needed to prevent the heater core from blowing out on early Pontiac's. Is this required for just AC vehicles or non AC vehicles.? I have a 65 Lemans wioth a soon to be 400 in it and I sure don't need to have this problem if I can prevent it.
V/R Jim (Salem, Oregon)

455 Formula

244 Posts

Posted - 15 Dec 2011 :  11:00:56 PM  Show Profile  Reply with Quote
Stock Pontiacs had a flat-wound spring in the heater hose nipple that acted as a restrictor. I use a 90 degree fitting up front with a 1/4" restriction...Robert
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