You could try Accosiated Diesel http://www.adiesel.com/volvopenta.php

Their parts list don't get down to the valves, etc. but they do show
pistons, injector, etc.

Since Volvo has discontinued the majority of it's nation wide (US) network,
you will still find the old dealer still have their parts books (and a small
inventory of parts). Go in and ask if your would late you compare part
numbers between the two engine. They don't have anything to loss now..

Steve
s/v Good Intentions