On some 440s, notably the single point injection B18U engine, the inlet manifold gaskets were prone to failure resulting in odd noises and rough running. I think the 440 GLT has a multipoint injection system and presumably a different inlet manifold. so this may well be a red herring.
So far as I recall I don't think any of the 400 series engines were particularly prone to oil pump or valve train problems.
Sorry I can't be of more help.
Martin
|