[77newell]

There probably are other changes between "green" and silver engines but certainly the silver is substantially less likely to leak oil. The changes were not all made at once and I can't recall the exact sequence but a little internet research will make it clear. That said, my 1985 engine leaks nary a drop since in-frame overhaul. Before overhaul it was leaking a lot of oil through the head to block interface that some idiot had used RTV instead of the appropriate o-ring to seal.

Jon
77 coach