On a major service on f. ex a 348, what is done exactly? Is it belts, tensioners, headcovergaskets, cam and cranck seals, rebuilding the waterpump, checking/adjusting valve clearance and then putting the engine back in? Missing something? Is this all the same for a 355 or a Testarossa? How often do this cars need engine out services? Are there any smaller services between engine out service except oil-change?