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Gear ratio is not the issue. I would guess your cam is retarded a couple degrees. The way its making power at 7K it would want to be shifted around 74-7500 for best ET and MPH. Nice gains with the intake. Had you ran it before at the track? Your car is craving more gear. 4.33 would be dandy in it!
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2010 C6 JET STREAM BLUE
BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85
Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE
10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake
Best 1/8 6.80@105.75
Best MPH 134.82
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