Fabricated Aluminum Long Bolt Valve Cover Black for Small Block Chevy 350. Whether you’re going for the hardcore race look or just trying to save weight, these fabricated aluminum valve covers are for you! These fully welded sheet aluminum covers feature a 1/8 thick flange for a great seal. Black matte powder coated for durable long lasting finish Bolts and washers included for mounting with valve cover. Included Bolt Length: 4-1/2. These valve covers contain pre welded baffles. Valve cover breather holes 1-1/4 ID.