We claim the ornamental design for an engine valve cover bolt, as shown and described.
FIG. 1 is a top perspective view of an engine valve cover bolt, showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof;
FIG. 4 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a cross-sectional view thereof, taken along line 7-7 of FIG. 3.
The broken lines showing an engine and additional engine valve cover bolts in FIG. 1 illustrate environmental matter and form no part of the claimed design.