I got my ls head off and want to clean the head completely. What can I use to clean the head without hurting the valves and seals. Theres a bunch of oil built up that looks like a big scap .

I don't know if you want to put anything chemical on it. See if taking it to a shop and having it hot tanked would work. I know that really cleans them up but I don't know if you can do it with the valves in without hurting the seals.