Our two-piece billet 7" Street Car Pulley is made of 6061 T-6 aluminum and bolts to a steel hub to insure strength. The machining process includes the stock style thread to eliminate crank case blow by. The belt groove is matched to the stock offset for proper alignment. After anodizing the pulleys are remachined the 360 degrees of timing marks to eliminate the old style stickers. The two pieces are mated together buy 8 countersunk allens to cap off the quality look. Uses stock 9.5 x 905 belt.