The Edelbrock Elite Series Valve Cover Breather is made from die-cast aluminum and is polished to a high shine. They have an Allen head bolt-on cover for access to their internal foam filter. The valve cover breather measures 3. 284 long, 2. 049 wide and 4 tall. It simply bolts to the top of any valve cover that requires this style. These breathers are designed to match the Elite Series valve covers except # 4246, # 4247 and # 4248.