studmobile
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My 1962 Harrington is getting a new head gasket, hopefully it needs nothing more. The rear opening that was originally hard piped through the intake has a 5/8 by 11 tpi bolt blocking it off. I'd like to add a fitting to run coolant from this opening to the "Y" at the water pump, probably 1/2" id. I have had no luck finding anything that matches the 5/8" with 11 tpi, everything is a finer thread. Thought I could get the bolt tapped so I could add a fitting with a barbed head to fit to a hose to the water pump. From the forum, looks like performance is better without the coolant running through the intake. But it also seems anything that promotes coolant flow through the back of the head would be helpful. Any thoughts appreciated. David