My 69Z is experiencing slight spark knock under aggressive aceleration. I am burning 93 octane, my air/fuel mixture on the carb is dialed in, my timing is 10* at 900 RPM. The motor was rebuilt when I bought the car so I don't know a lot about it. I have recognized that the car seems to run with limited to no SK with the breather assembly off. Maybe just a coincidence but this did happen. Also, I have noticed at times when I get 93 octane as some stations the fuel quality will vary. If I put 100 octane in it runs great. Just wanted to see if anyone else is expericing anything similar. Eric Jackson at Vintage Muscle Car parts rebuilt the Carb.
What cam? A DZ at 11:1 with 30-30 cam replacement (not a new "modern fast ramp cam) should run with aggressive timing on 93 easy.