Originally posted by CarGuy7a
if it smoked more after changing the valve seals. you may have got them on the wrong valves.

example. exhaust seals on intake valves and vice versa.

not sure if the 400ex seals are one side only like that but it happened when i had the heads on my truck done after it bent a valve. the guy who did my heads put the valve seals on the wrong valves on every cylinder and it smoke like crazy.

might be something worth looking into.

alright thanks. How do you know which seals go on which valve?