- Apr 1, 2012
- 4
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I have a 1969 S Code. The engine has 2000 miles on the rebuild (10.1)in 18 months the motor has started pinging under load when it warms up. I have retarded the timing 1.5 degrees from what the engine guy set it at 8 degrees. I was wondering if changing to 100 Octane would help I'm currently using 93 octane no ethonal. Would appreciate any thoughts on this.