Thread: Engine Upgrade to 550 Horsepower!
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Old 11-13-2002, 01:42 PM
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Remember that the transmission is a 4L65E (a beefed up 4L60E). Chevrolet mates a 4L80E with the 6 liter engine rated @ 300hp. and 360lb. torque in their truck line. More torque might load the load the tranny pretty hard.

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