It was burning a quart in 400 miles before I changed the valve seals.
It now uses a quart to 4500 miles. The manufacturer says burning a quart in 800 miles is considered normal in the new ones.
My point is that the engine is as good as new. Certainly not the "cheapest" as was asserted above.
Excellent.
I should point out that I'm a kind of Crown Vic wonk: I would drive nothing else, I service my own, and have amassed a pretty extensive knowledge base (for a lawyer, anyway) on their operation. Mine's a 96 with 148k. Runs like a top (LX trim, cop guts).