Posted by Dave Horvath [76.125.248.166] on Sunday, September 22, 2013 at 20:13:58 :
In Reply to: Heat Risor? posted by Sterling [166.147.123.151] on Sunday, September 22, 2013 at 17:33:57 :
In summer, it should be open, allowing heat to pass straight through the exhaust manifold without being directed upward into the hollow chambers of the intake manifold. Most times, they are broken and/or stuck in one position or the other. Some guys just remove them.
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