We tested the car yesterday and when really hot it started slightly ping even with 8/28* setting. Pinging occured at every rpm/load. We wait for the package with different distributor springs. One more fact - the engine diesels for 1-2s after shut off. We tried 3 different plug heat ranges and no difference. Also minimizing advance even to 0/20* does not eliminate it. Idle is 900 rpm.
