Searching high and low for a supercharger that would send our Sierra into the upper echelon of performance automobiles, our mission ended once we found the MagnaCharger MP2300 supercharger. The MP2300 uses the same technology found in the Corvette ZR1's supercharger, and combines a four-lobe rotor with high-twist 160-degree helix that has improved efficiency, is quieter than previous superchargers, and has cooler discharge temps. Combine those improvements with MagnaCharger's bypass valve system that reduces parasitic drag during normal driving so that no energy is wasted, along with an integral water-to-air intercooler, and the decision to go with the MP2300 was an easy one. It also helps that MagnaCharger is well-known throughout the industry as having world-class installation hardware and every kit comes complete with everything needed.

We hate the thought of having a performance truck with an automatic transmission and we wish that Chevy would have followed the original Silverado SS concept and put a stick shift in the production truck.

Just as Chevy used in the Corvette ZR1, we'll be using a Tremec T-56 six-speed manual transmission from Hurst Driveline Conversions in our Sierra. Going one step bigger than the traditional T56, we've opted for the big daddy from Tremec-the T56 Magnum. Capable of handling 700 lb-ft of torque, the Magnum uses upgraded internals for added strength and longevity and is designed to bolt right up to an LS engine bellhousing or scattershield. With two available gear ratios, we were able to mimic the ZR1's 2.97 First gear ratio and with double overdrives of .74 and .50 ratios, the T56 should put our LSX376 into mileage-friendly low cruising rpm. If you've ever shifted a T56, either in a 'Vette, Viper, Camaro, or Mustang, you know that our Novakane truck will be a real blast to drive and should be leaving two black tire streaks all over our test track.

Providing the engagement of our Tremec T56 Magnum will be a Street Dual II clutch from RAM. Designed for high-horsepower street performance where a stock pedal feel is desired, the Street Dual II clutch can hold up to 950 lb-ft of torque, is extremely quiet when engaging, and doesn't require excessive pedal effort like so many aftermarket clutches.

Add to the clutch RAM's new hydraulic release bearing and billet flywheel and our GMC will officially be snapping off ultra-quick launch times.

Whereas 620 flywheel horsepower sounds awesome, we're greedy and the desire to have more power kept itching away at us. If 6 psi is good, wouldn't 12 psi be better? Yes. The answer to more power is always yes. Don't miss next month, when we'll show you the exact components needed to take our LSX small-block into the supercar performance world.

In this story, we also included a quick engine removal tutorial for 4.8L and 5.3L LS-based engines. This isn't a step-by-step how-to article, but it will give you a good idea of what is needed to pull an engine and what you should expect when doing a transplant. Always refer to your repair manual when pulling an engine and don't forget to ask a few friends for help.

1990 Knoll Drive
CA  93003
Chevrolet Performance Parts
P.O. Box 33170
MI  48232
14700 Helm Court
MI  48170
RAM Clutches
201 Business Park Boulevard
SC  29203
Hurst Driveline Conversions
1340 Specialty Drive
Suite A
CA  92081