Timing is everything - so you might as well do it with style. Billet Specialties billet aluminum timing cover is precision machined from 6061-T6 aluminum and polished to perfection. Engineered to fit 1965-90 Big Block Chevrolet® Mark IV engines. This 10 bolt timing cover features improved clearance up to .720" to clear most timing sets and includes two billet timing pointers to fit both 7 and 8 inch dampers. Add serious style to complete the package for the ultimate timing cover for a big block Chevrolet®.