Cover is drilled for a oil sight glass and a 1/8" pipe pressure relief valve. Front cover is set up for 5/16" dowel pins but can be drilled for a larger size. Fits all roots blowers 6-71 thru 16-71. Cover is shown in pics polished but is sold in machine finish.
Polish adds $40.00 or the racer can choose black or gray anodized for an additional $50.00. Please specify if you want starter bosses on the front cover and if you want a GM type front cover or a symmetrical front cover as shown.
RBS carries a full line of gaskets as well for the superchargers if the racer needs.