Up for sale is a REBUILT Vacuum Advance Chamber for the ignition distributor.  Replaces GM # 1116050.  We have a couple of these available, so the one you receive may look slightly different than the photos but will be in the same condition.  This will fit the following:

1940-1954 Pontiac with 8-cylinder engine

CORE RETURN:

The purchase price of the vacuum advance includes a REFUNDABLE CORE CHARGE.  This core charge is refunded upon receipt of your complete, original style unit in rebuildable condition.  Please be sure to carefully package your old vacuum advance for a safe trip to us in order to avoid damage in transit.  Please contact us via eBay Messages for core return address.