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Has anyone confirmed if a 3/4 barb fits or not? I want to order a fitting tonight but don't know if it'll fit.
...but had trouble getting the threads to seal in the intake with red Permatex. Guess I used the wrong thread sealant.
Use pipe dope from the plumbing department.
Thanks.
Any idea how far these fittings are supposed to thread into the intake? Running it about halfway in seemed pretty tight. I never could find a torque spec for the original fitting.
Just noticed my 98 5.7 is leaking at this fitting again. Time for an upgrade like this. Thanks for the write up!
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Much ado about nothing. If you guys are burning through these heater fittings on a frequent basis, you've got something wrong and you're not fixing the right thing. Sure, the fitting corrodes, and you need to replace the fitting. But WHY did it corrode?
1. Coolant used beyond it's service life becomes acidic and will then cause corrosion. It can also create "radiator voltage" due to the electrical action of dis-similar metals--the iron, aluminum, brass, and copper sharing the same electrolyte (coolant) become a giant low-power battery. The stray electricity can cause corrosion. Solution is to flush and replace the coolant as needed, and use a proper concentration of anti-freeze which contains corrosion inhibitors.
2. FAILURE TO PROVIDE PROPER ELECTRICAL GROUNDS can "electrify" the coolant, causing electrolysis corrosion.
Original fitting on my K1500 went about 200,000 miles. Replacement (Dorman, I think) fitting has about 100,000 miles, 18 years, and is leak-free and corrosion-free. I pulled it out of the original TBI intake manifold, and screwed it into the replacement (ZZ4-style) manifold about four weeks ago.