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Aluminum Tube

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17. There's a small aluminum tube (circled) that comes with the intake manifold. It installs with a light press fit. I used a soft-faced mallet to tap it in before bolting up the water pump. I also coated the tube's mating surface with JB Weld for good measure. I'm mocking up the two tubes here, making sure they won't touch when the water pump is bolted to the block.