My Corvette appears to have a slight oil leak from the bottom of the aluminum heads. Is this common with 1987 vettes. I have sent my oil to be analyzed for antifreeze. I have an irritating oil smell but it doesn't seem to be using oil.

Glenn, you didn't say where from the heads but if it's at the rear, it's not uncommon for the intake manifold to leak there. A few drops of leaked oil won't be obvious at the dip stick but they can really smell when hot.