Originally Posted By: rcy
Just an FYI - sometimes the lower spark plug seals also leak. They're much harder to replace.
Are those just plain rubber o-rings, rather than the specifically-shaped thicker rubber seals? If so, that would explain why the replacement gasket kit came with the extra o-rings. We could find no place to put them, so we didn't bother installing them, but I hung onto them just in case.
How would one go about replacing them? There were no visible o-rings in the bottom of the spark plug wells.