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Old 01-26-2011, 01:28 PM   #4
dbmx66
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Join Date: Aug 2009
Location: PA
Posts: 883
Re: Heater Hose Fitting thread size on Edelbrock # 2101 intake

they generally use 1/2 NPT which its close to a .75 hole, but its a tapered tap. i know when i still had my heater, the fitting on the intake and on the water pump were both 1/2NPT but the bungs were 3/4 and the other was 5/8
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