Weiand Chevy Backfire Valve Kits are machined from Cast aluminum. These spring loaded valves are designed to relieve excess pressure caused by mild engine backfires, as a result of that it helps prevent damage to the blower and other related components.
(1)Backfire Valve Plate
(2) Aluminum Spring Retainers
(2) Backfire Valve Springs
(2) 3/8-16 x 2.00 bolts and washers.