The bosses, which look like rings or donuts, on the inside indicate locations where holes can be machined if needed for PCV, breather, and oil fill. These covers do not come with holes but they can be machined on the top or the side. Holes do not interfer with script. Can machine holes for a $45.00 machining charge per hole.
Covers do not include any holes: $45.00 charge (for EACH hole) drilled.
For each hole required, you will need to order (BL-Holes).