Thread: permatex for intake manifolds?

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can I use ultra black? Is it compatible with gasoline?
or do you have a preference for something else?
thanks,
Drew

Originally Posted by DeepRoots

can I use ultra black? Is it compatible with gasoline?
or do you have a preference for something else?
thanks,
Drew

I used Gasgacinch on the head side to ensure that the gasket stayed put, then blue silicone around all of the water ports on the head side. My system said to use sensor safe sealant or you risk problems with sensors for MAP, O2, etc. I would save the ultra black for oil applications - not sure ultra black is as good for water/antifreeze, but I know blue is. Just my approach...

Ultra Black is a RTV Silicone product. When you apply the material, it is relatively slippery before it cures, allowing for a gasket to easily slide. On a small block Chevrolet intake, the lower edge of each port is thin and the gasket can easily "squish" downward creating a serious vacuum leak. I would recomment that you NOT use an RTV Silicone on intake gaskets....use something thicker like the Gasgacinch or Permatex (the thick goo) applied very thinly.

It is OK to use RTV Silicone on the ends of the manifold.....the best way to close up the gap. Don use the end gaskets, just a fat bead of RTV.

mike in tucson

I have taken engines down apart and found RTV all over the pickup screen on the oil pump. For what thats worth...