The Stovebolt Site Forums The Shop Area Engine Shop Intake gaskets

Doyle, If you find you have a vacuum leak (and you may not) and the leak turns out to be where the manifold attaches to the head, here's an option for you (compliments of Evan / Coilover who is sadly no longer with us): Use the high temperature silicone sealant rather than any of the overpriced "specialty" gaskets. It is red in color and I saw some made by J-B Weld that had a higher temp rating. He showed me a straight 8 he had done this on and said it had over 25,000 miles with no leaks nor problems. He said what he did was to apply a ring about 2mm to 1/8inch in diameter about 1/4 inch from the inner edge of both sides of the metal gaskets, let it cure until it barely had a skin and then bolt the intake manifold on. I have not found there to be too many leaks at the phenolic spacer. Almost all these throttle bodies were cast iron and it usually doesn't deform. Good luck!