Originally Posted by denverd0n
A cracked manifold should be replaced. For the short term, in the meantime, you can use JB Weld to close it up.
I tried JB weld and a couple other muffler-patch cremes, but they all burnt off and smelled like hell.
I ended up just ordering a replacement grade manifold off ebay...
$140 got me the manifold (with lifetime warranty) and gaskets shipped...
If it breaks, I live about 15 miles to the distributor, and will throw it through their window. then yell. then fart and run.