Ls1 Engine Build Valley Cover
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After removing the masking tape from the intake ports, clean the cylinder head surface thoroughly and look into the ports one last time to make sure no foreign material is in there. Although the LS1 intake manifold uses durable rubber port seals instead of old-style gaskets, they still need a clean surface in order to seal properly. You can see the wiring harness for the knock sensors in the foreground; this is your last chance to install this item before it's hidden beneath the intake manifold! View Related Article
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