CC-127010: THUMPR™ - Great idle with excellent power. Good mid-range torque & power gains above 4500 rpm. Compatible with stock valve springs, converter & gears.
CC-127020: MUTHA' THUMPR™ - Very rough idle, biggest cam for stock heads. Great power above 4900 rpm. Compatible with stock valve springs, benefits from converter & gears, requires cam phaser upgrade & custom tuning.
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