Have you had a AFR meter hooked up to know your air/fuel ratio?
Something doesnt sound right to me. I had the .509 in a 10.5 to 1 iron headed motor. I never had ANY detonation with that motor. Open chamber heads, so no quench at all.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
