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What does your ignition map look like? Initial timing setting, how much centrifugal advance in the distributor, at what rpm does it start, when is it "all in", what are the specs (degrees at inches Hg. vacuum) of your vacuum advance can, and is it connected to ported or full manifold vacuum? What is your manifold vacuum reading at normal idle? Short of mixing race gas, the only adjustments you can make to reduce or eliminate detonation are changes in ignition timing.joe1975 said:My 75 has a fairly new rebuild Edelbrock heads, intake ,holley and 10.1 compression pistons, comp cam( 268 cam) good money been spent now I'm trying to make the best of it detonation comes in about 3500 not good I'm just looking for some tips?