[prostreetC-10]

Is the initial at 23* with or without the vac line hooked up? Careful giving it too much timing without knowing how much mechanical is built into the dizzy. The more initial you put into a motor, the more the "cam" sound will go away. What were you running for initial with the Thumper? Put 'er back down to 4* and she'll sound lumpy....just no power.