Interesting question, in theory yes so liong as you can compress the valves and put rope etc in bores, would be a pig of a job though in situ.
Might it be worth trying some of the seal swell ?, you know the rejuvinator stuff like LECWEC.
Have a look in the pipes from turbo to intercooler to see if there is any oil there, if so it has come from your turbo, or engine breather, check these are clear first.
tabetha