i just installed a timing plate the other day, set it at +3 for now.
anyway when i still had the cover off i fired it up and played with the timing a bit with the motor running. i put in earplugs and wanted to see how far i could advance it before hearing detonation.
i had the plate loose enough that i could move it by hand, and i went all the way to +10 for a few seconds and revved the motor a bit. I couldnt hear anything different at all, other than it revved quicker :shrug:
it has the head shaved .020, i think my compression is in the 140s maybe 150, and im on 91 octane.
i am curious to know what detonation sounds like because i thought it would be good knowledge and for a few seconds it wouldnt hurt anything.