<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10px"><div id="yui_3_16_0_1_1428509387621_6607" dir="ltr">I think my shiny alloy one looks high performance. Biggest plus is that you can tighten it down properly and cover doesn't deform. Cork gasket sealed to cover with gasket goop and no leaks. </div><div id="yui_3_16_0_1_1428509387621_6607" dir="ltr"><br></div><div id="yui_3_16_0_1_1428509387621_6607" dir="ltr">Think there might be a silicone? valve cover gasket out there somewhere but haven't looked into it. as what I'm doing seems to work.</div><div id="yui_3_16_0_1_1428509387621_6607" dir="ltr"><br></div><div id="yui_3_16_0_1_1428509387621_6607" dir="ltr">Bruce Simms</div></div></body></html>