You can run stock HC heads on an 03 but run 91 or higher pump gas, preferrably 93. Jet way up, using the chart on the belt gaurd. I run 310-300 or 320-310, depending on temps, elevation etc. Unplug the connector for the octane switch, as this will default the timing to the 91 octane setting and no one will flip the switch, accidentally thinking it was a headlight dimmer switch at night. Good luck with your 03. I love mine.
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