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Felser posted a topic in Bolt On PerformanceSpecs on vehicle are 2001 Sierra standard cab w/05 6.0L,4L80e,3800 circle d converter,e-fans,long tube headers, exhaust Want some good power and still be able to drive it in the weekend with no problems. Some upgrades I plan on doing are to run ethanol as a fuel source and tune. I need help choosing specs on cam. I’ve never swapped out factory cam with aftermarket cam so any advice suggestions help thank you