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Knocking and Ping noise

(1997 Chevrolet Express 1500)
in Suitland, MD on May 31, 2010
Van overheated.. I changed the knock sensor, changed oil and coolant still knocks ....can not excel over 20pmh or hear knocking / pinging. Recently changed thermo, distributor, adjusted timing, tune up and put B12 in Gas tank & used 93 Gas. Mechanic advised me to drive it fast to see if it blow out carbon / deposits... It overheated again !! I believe it's intake manifold.
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