My concern with a DD and chrome underhood parts is rust and crud. Good ones wont leak any more the tha OEM steel pieces, but....they WILL rust - quickly. For a DD, a good paint job will suffice plus be much easier to keep clean then the chrome versions. Mine are - gasp, gag - Billet Specialties aluminum (those valve covers are not the Billet Specialties that are on the engine now, but inexpensive Summit's).