Black Aluminum Ball Milled Chevy Small Block Valve Cover. There is one 1.25 push in style breather hole in each cover. Powered by SixBit's eCommerce Solution.The item "58-86 Black Aluminum Short Valve Cover SBC Chevy Ball Mill 283 305 327 350 400" is in sale since Monday, August 31, 2015. 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.