GM Licensed Valve Cover Track Series SBC Fabricated Aluminum Center Bolt 1987-1997 Chevrolet Small Block 305-350 Cubic Inch Tall (3.75) No Hole HolleyHolley is pleased to release its latest fully licensed product Gm Track Series Fabricated Aluminum Valve Covers. The Gm Track Series family of valve covers gives you an excellent way to add a high end fabricated look combined with a lightweight and tough valve cover for your favorite Chevy engine. These valve covers are constructed of 6061 T5 sheet aluminum, feature a laser etched Chevrolet and Bow Tie logo, and precision Tig welded for a proper fit.