Thanks everyone. I am not plugging it I need a nipple for my heater hoses. But I need something with a 90* bend to clear my Holley fuel feed lines. I also read in an older thread that the 3/4" heater hose should run to the water pump, and the 5/8" hose to the manifold...I had them set up the other way around. Not sure if that would have made a big difference. Thanks again guys....gonna head over to G&J for some fittings today.