Edelbrock Oldsmobile big-block E-Series Cylinder Head Bolt KitEdelbrock E Series Cylinder Head Bolt Kit #85582 is a high quality replacement bolt set for big block Oldsmobile engines equipped with Edelbrock Performer RPM cylinder heads. This bolt kit is required when installing Edelbrock heads on an engine previously equipped with cast iron heads. With Edelbrock and other aftermarket aluminum heads, a washer is required which this kit provides along with longer bolts to compensate for the added thickness of the