Russell Benter Bolt Spark Plug Wire Dividers are specifically designed to fit 1987 and later small-block Chevrolet centerbolt valve covers. They’ll work with OE and most aftermarket centerbolt valve covers for excellent versatility. They can be used with both front and rear mounted ignition systems and include all the necessary hardware. The looms are constructed from billet aluminum and are available in a number of professional looking finishes.