My engine is pinging under heavy load, now i forget how to fix it ... is it turn the distributor towards the firewall or away? using the vaccum advance module...

Pushing the vacuum advance cam toward the firewall will retard timing and reduce pinging. I cringe to tell you this, especially since you are experiencing pinging and don't have a timing baseline. Borrow a timing light and find out where you really are - timing wise. http://www.nastyz28.com/ubb/smile.gif Once timing is correct, you might find that the pinging is caused by something else.

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79 Z28 Bought new, honeymoon ride, same wife, same car.

[This message has been edited by CorkyE (edited July 28, 2005).]

turn can back towards the firewall. That retards the timing. Turning it toward the carb advances timing.

You really need to put a timing light on it and see what you got now, then back off the timing 2*. It really don't take much turning to change the timing 2, 3 or even 4*

try setting the total with a light at about 36 if it still pings I'd play with the advance curve before retarding the timing.