How do you change valve seals on a v8 engine?

Answer 1

first determine if the manufactuer of the engine requires a tourque setting and sequence for the engine in question. If so get your hands on a tourque wrench! Next remove antyhing above and in the way of the covers ie: vacum lines, spark plug wires, brackets ect. Radiator hoses that are not too old and cracked can be left on and flexed out of the way. Next remove the bolts that hold the covers on and firmly pull the cover off. If the old seal was glued or made of cork/fiber use a scraper to remove all of the glue and bits of seal that are stuck to the covers do the same for the same on the head flange if an debris remain stuck to it be carfull not to let anything fall into the engine. if it's really bad and you need to scrape stuff rags into the openings. Next clean both surfaces that contact the seal free of any oil and grease. dish soap and water for the first pass and finish off with acetone( you'll want to wear glove for this). I highly recomend a silicone seal as this requires no glue but if your stuck with a cork one use a small bead of gasket sealer on the flange. If you have a sliicone gasket install it on the cover side you may have to stretch it slightly.finally replace bolts and snug them down ( or if required by manufacture tourqe to specified foot pounds and follow sequence). replace all brackets wires and or hoses in reverse order they came off ......that's about it.

The above answer is way out in left field. The question referred to Valve Seals. They are the seals that go on the valve stem to prevent oil from fouling the spark plugs. It would be best to purchase a Haynes Manual from most parts stores.