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RE: You need vacuum advance. By Royce Peterson - 10/01/2001 2:45:20 PM; IP 205.188.193.168 Steve, There is probably a point where if you have way too much compression combined with a mild cam that the pinging would be impossible to get rid of. Have you ever measured cold cranking pressure? Mine is about 210 PSI. I tried all kinds of fuel additives and my personal opinion is that none has any significant effect. I tried Techron, Outlaw, 104 and Real Lead brands among others. If you really want to improve your gasoline a mixture of 50 percent 110 octane race gas with 50 percent super unleaded works wonders. I can run another 5 degrees initial . Also, don't worry too much about the actual number of degrees. Try adjusting the timing until the ping is gone for the fuel being used. That's all that really matters. Royce Peterson

This thread, so far...

Skip Navigation Links.  '67 Shelby 428 "pings" under load...need help -- Steve Boulay, 10/01/2001  RE: '67 Shelby 428 "pings" under load...need help -- Morgan, 10/01/2001  You need vacuum advance. -- Royce Peterson, 10/01/2001  RE: You need vacuum advance. -- Steve Boulay, 10/01/2001  RE: You need vacuum advance. -- Steve Boulay, 10/01/2001 RE: You need vacuum advance. -- Royce Peterson, 10/01/2001  RE: You need vacuum advance. -- Royce Peterson, 10/01/2001  RE: '67 Shelby 428 "pings" under load...need help -- Mel Clark, 10/02/2001

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