Exhaust Manifold Gasket
IF THE IMAGE IS TOO SMALL, click it.

Ford didn't install gaskets on these exhaust manifolds, and neither should anyone else. They cause leaks, rust, and warping. Ford installed them with a thin layer of chassis grease which became carmelized during the first warmup like seasoned cast-Iron cookware. The modern equivalent is high-temperature silicone, and it DOESN'T take much. All the threads (in the heads, and all the nuts, bolts, & studs) must be clean, and lubricated with Nickel (hi-temp) anti-seize lubricant, which should also be applied to the flange surfaces between the EGR tube, manifold, & Y-pipe. The long manifold-to-head bolts with stud head is 388469-S. The long bolt without stud is 381732-S. Short w/o is 392016-S4301.



Aftermarket replacement sets are also available for 5.0L/5.8L: Left Dorman 03405; Right Dorman 03407B or Dorman 03407



The manifold-to-Y-pipe studs are 391104-S2; the nuts are 375636-S7 :



For the whole process:

Owner caption October 2022 · Photo 0 of 5000