[Amc-list] detonation

[Keith Evenson <epd@xxxxxxxxxxxx>]

So this is the deal. As some of you may remember, I just had my 390  
rebuilt and it dyno'd best with the timing at about 36 degrees adv.  
at 2500 rpm. Since I got it in the car I have been having some  
detonation issues. I was running 92 oct. (which is what I used at the  
dyno) and in the car it runs great but when I put it under some load  
it has what I am calling detonation. I have lower the timing a bit to  
about 34 degrees and I have used the NOS brand octane boost. Still  
getting the detonation. Yesterday I went to the local airport and put  
in 6 gal of 100 octane with the rest of the tank filled with 92. I am  
still getting the noise but it is not as bad. So should I go to a  
50/50 mix or try lowering the timing more or is there something else  
anyone can suggest? I have run it with the vacuum advance  
disconnected and still getting it.
I have this great new motor and I can only run it about 1/2 to 3/4  
throttle so I want to DRIVE my car not just put around in it.
HELP!
Thanks,

Keith Evenson




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