Chromed Aluminum Smooth Chevy Small Block Valve Covers. There is one 1.25 push in style breather hole in each cover. Powered by SixBit's eCommerce Solution.The item "Chrome cast Aluminum Small Block Chevy Valve Cover 305350327400 Smooth Tall SBC" is in sale since Tuesday, March 18, 2014. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Valve Covers". The seller is "motornets" and is located in Chino, California. This item can be shipped worldwide.