Join Date: Jan 2001
Location: Knoxville, Tennessee
The original finish on the locks would be black paint (engine color). When the engine was assembled and painted black, there was black overspray on the exhaust manifolds, exhaust manifold bolts, and locks. That paint would eventually burn off, but some amount of paint will stay on the bolt heads and the locks. On the original, low mileage cars that I've seen, the locks are differing shades of black, due to how much paint remains. The backside of the locks will be natural with varying amounts of black overspray (depending on how heavily the paint was applied).
My signature pic should give you a pretty good idea of what I'm talking about.
65 Mustang Convertible 289 C-code
Rangoon Red with White w/Red Appointments Deluxe Interior