I am interested in the Sparking +6 Timing Key to maybe up my compression a tad bit more. I am running .040 over bore 86mm or 406 with 10:1 compression. I also have a stage 2 cam. I know they do not advise to use with higher compression or bigger bore. Just trying to see if anyone has tried the key with a small upgrade on bore size and compression and if it was at all beneficial or if it hurt the motor.