4. A Powermaster direct-replacement alternator with the new satin finish looked perfect on the background of an orange and polished aluminum small-block. Every Powermaster alternator is tested and rated before leaving the factory. This one puts out 103 amps at idle and 161 amps when doing highway speeds, and is set to run at 14.8 volts DC. I used a Summit billet alternator bracket kit with an expandable rod end link that allows us to position the alternator correctly and increase belt tension with a wrench.