Test Motor #2-Mild LM7 5.3-Liter

Block: Stock
Crank: Stock
Rods: Stock
Pistons: Stock
Cam: Trick Flow Specialties .575 lift, 220/224 duration split, 112-degree LSA
Heads: TEA Stage 1 CNC 5.3-liter
Intake: Stock
TB: Accufab 78 mm
Headers: QTP 1¾-inch long-tube
Peak Power: 436 hp at 6,200 rpm
Peak Torque: 410 lb-ft at 5,100 rpm
Torque Curve: Exceeded 375 lb-ft of torque from 3,800-6,100 rpm

For those looking to enhance the power output of their 5.3-liter without sacrificing throttle response and low-speed torque, this 5.3-liter is ideal. Using the stock short-block, we upgraded the heads and cam to dramatically improve the midrange and top end power without the usual trade off in low-speed torque. In fact, this combination improved the power output of the 5.3-liter from 2,500 rpm right through 6,500 rpm. The TrackMax cam from Trick Flow Specialties offered an excellent combination of power and idle quality. The combination of the ported 5.3L heads from Total Engine Airflow and mild TrackMax cam increased the power output of the 5.3-liter from 356 hp and 378 lb-ft of torque to 436 hp and 410 lb-ft of torque. You will want to reprogram the full-throttle shift points in your tranny to take advantage of the extra power at the top of the rev range.