Feb 12, 2009 #1 T tech1gmc New Member Joined Feb 12, 2009 Messages 8 Is the powermaster came only on the 86-87, if so. What did they have before?
Feb 13, 2009 #3 Royal-T-Ltd Well-Known Member Joined Jul 12, 2003 Messages 4,326 late production '85s had them too..... but yeah for the majority - Hydroboost