harry yarnell Posted January 12, 2010 Share Posted January 12, 2010 The coolant bypass nipple on the pass. side intake manifold is made of plastic on the code L motors. With age, they crack and break. Replacements are made of metal. Before I tear off the altenator to get to it, I need to know what the thread size is (3/4 pipe?) and the hose size (3/4,5/8?)and how long the piece sticks out of the manifold. NAPA has a bunch of different sizes, and the clerk didn't have a clue. Link to comment Share on other sites More sharing options...
dship Posted January 12, 2010 Share Posted January 12, 2010 Harry,I looked it up in the 86-93 Riviera parts book. It doesn't list any demensions that you're looking for but I am at least able to give you a part number...25535749, Fitting coolant by-pass to intake nipple.Hope this helps. Link to comment Share on other sites More sharing options...
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