Introduction: Unlocking the Full Potential of Your 70Z

Installing a supercharger is one of the most effective ways to dramatically increase the horsepower and torque of your 70Z. The Edelbrock E-Force Stage 2 System is engineered to deliver a substantial power gain while maintaining drivability and reliability. This guide provides a thorough, step-by-step walkthrough of the entire installation process, from gathering tools to final testing. Whether you’re a seasoned mechanic or a dedicated enthusiast, following these detailed instructions will help you achieve a safe and successful installation.

The Edelbrock E-Force Stage 2 System is a roots-type supercharger that produces smooth, linear boost across the rev range. For the 70Z platform, it can add approximately 125–150 horsepower to the wheels when properly tuned. This installation requires moderate mechanical experience, a well-equipped workspace, and careful attention to torque specifications and clearances. Always consult the full Edelbrock instruction manual included with your kit for the most current details.

Tools and Materials Needed

Before starting, ensure you have all necessary tools and the complete supercharger kit on hand. Missing a single specialty tool can halt the project.

  • Edelbrock E-Force Stage 2 Supercharger Kit (including all gaskets, fasteners, fuel injectors, intercooler, drive belt, and hardware)
  • Socket set with metric and standard sockets (1/4”, 3/8”, ½” drive)
  • Torque wrench (ft-lb and in-lb ranges)
  • Combination wrenches (8mm to 19mm)
  • Phillips and flathead screwdrivers
  • Electric drill with assorted drill bits (for optional coolant hose relocation)
  • Vacuum cleaner and compressed air (for engine bay cleanup)
  • Shop towels and degreaser
  • Safety glasses and mechanic’s gloves
  • Coolant drain pan (required for intercooler coolant replacement)
  • Fuel line disconnect tool (if included in kit or purchased separately)
  • Digital multimeter (for electrical checks)
  • Engine support bar (if lifting the engine during intake removal)
  • Thread-locking compound (for critical fasteners)
  • Upgraded fuel pump (if pushing beyond stage 2 power levels)

Preparation Steps: Setting Up for Success

Proper preparation reduces frustration and prevents damage. Follow these steps before touching any hardware.

  • Park the 70Z on a level, well-ventilated surface. Ensure the engine is completely cool.
  • Disconnect the negative battery terminal and secure it away from the post to prevent accidental contact.
  • Relieve fuel system pressure: locate the fuel pump fuse in the engine bay fuse box, start the engine, let it stall, then turn the key off. Disconnect the battery after stalling.
  • Drain the engine coolant (if repositioning coolant lines) and the intercooler system coolant per kit instructions.
  • Remove the factory air intake assembly, air filter housing, and mass airflow sensor (MAF) to gain access to the intake manifold.
  • Thoroughly clean the engine bay, particularly around the intake manifold and cylinder head mating surfaces. Use compressed air to blow out debris from crevices.
  • Lay out all supplied parts and verify them against the Edelbrock parts list. Locate the instruction manual for torque values.

Removing the Stock Components

Carefully remove the factory intake and fuel delivery components. Work methodically to avoid damaging wiring or vacuum lines.

  • Factory intake manifold: Loosen the manifold bolts in a reverse sequence (outer to inner) using a socket and ratchet. Disconnect the knock sensor wiring harness and any vacuum lines attached to the manifold. Lift the manifold straight up to clear the fuel injectors. Use a plastic scraper to remove old gasket material from the cylinder heads.
  • Throttle body: Unbolt the throttle body from the factory manifold. Disconnect the electrical connector and coolant lines (if equipped). Set aside for later reuse on the new supercharger intake.
  • Fuel rail and injectors: On the 70Z, the fuel rail is attached to the intake manifold. Remove the fuel line using a quick-disconnect tool. Unbolt the rail and pull the injectors out. Keep the injectors clean; they will be replaced with larger ones from the kit.
  • Drive belt: Loosen the tensioner with a breaker bar and slip the belt off the crankshaft pulley. Remove the belt completely.
  • Alternator and accessory brackets: The Edelbrock kit may require relocation of the alternator or power steering pump. Follow the manual closely, unbolting and labeling all fasteners.

Installing the Edelbrock E-Force Supercharger

This is the core of the installation. Take your time and double-check alignment.

  • Prep the intake ports: Install the supplied gaskets onto the cylinder heads. Apply a thin layer of silicone only where specified by Edelbrock (usually at the front and rear coolant passages).
  • Position the supercharger assembly: With help, lower the supercharger onto the engine. The unit is heavy, so use a jack or engine hoist if possible. Align the mounting studs with the head bolt holes. Do not force it; it should seat evenly.
  • Secure in steps: Hand-tighten the supercharger mounting bolts (usually 6 large bolts) in a cross pattern. Torque to the specified value (typically around 25–30 ft-lb) using a torque wrench. Re-check after all are tightened.
  • Install the drive belt: Route the new, shorter belt over the supercharger pulley, crankshaft, and tensioner. Use a long breaker bar to move the tensioner and slip the belt on. Verify belt tracking on all pulleys.
  • Attach the throttle body: Reuse the factory throttle body on the new intake elbow. Use a new gasket. Tighten to spec.
  • Install the intercooler and piping: Mount the intercooler radiator in front of the engine (often in the front bumper area). Route the silicone hoses from the supercharger outlet to the intercooler, then to the intake manifold. Secure all clamps evenly, but do not overtighten.

Connecting the Necessary Components

Reattach all systems that were disconnected, and integrate the new supercharger components.

  • Fuel system: Install the supplied larger fuel injectors into the new fuel rail (included with kit). Connect the fuel line using a new O-ring. Ensure the injector clips are fully seated.
  • Vacuum lines: Connect the brake booster line, PCV hose, and any other vacuum lines to the supercharger manifold. The kit typically includes a new vacuum harness diagram.
  • Electrical connectors: Reattach the knock sensor, throttle position sensor, MAF sensor, and any coolant temperature sensors. Use dielectric grease on connectors for corrosion resistance.
  • Coolant hoses: If your 70Z uses the stock coolant hard pipes, you may need to relocate them. The Edelbrock kit provides a new coolant crossover pipe. Fill the intercooler system with the specified coolant (usually a 50/50 mix of distilled water and antifreeze). Bleed air from the highest point.
  • Check clearances: Rotate the crankshaft by hand using a breaker bar on the crankshaft bolt. Ensure the belt does not hit any hoses or wires. Manually cycle the throttle body to confirm full range of motion.

Tuning and ECU Calibration

The Edelbrock E-Force Stage 2 System requires a custom tune to run safely at higher boost levels. Running a supercharger on the factory calibration can cause detonation and engine damage.

  • Handheld tuner: The kit usually includes an Edelbrock ECU flash tool (or a SCT or HP Tuners device). Follow the instructions to upload the base tune specifically for Stage 2.
  • Data logging: After initial startup, log parameters such as air/fuel ratio, boost pressure, and knock retard. A wideband oxygen sensor is highly recommended for safe tuning.
  • Professional tuning: For maximum power and safety, consider a dyno tune by a reputable shop familiar with the 70Z platform. The base calibration is conservative; a custom tune can optimize timing and fuel curves.
  • Emission compliance: Note that some tunes may affect emission legality. Check local regulations and keep the stock calibration backup.

Final Steps and Testing

Before taking the car on the road, perform a thorough inspection and a controlled test drive.

  • Consult the official Edelbrock website for the most current torque specs and any technical bulletins for your specific vehicle.
  • Reconnect the battery and check all fluid levels (coolant, intercooler coolant, engine oil).
  • Prime the fuel system by turning the key to the “on” position for 3 seconds, then off, repeating 2–3 times without starting the engine.
  • Start the engine. Listen for any abnormal noises: ticking, squealing, or knocking. Immediately shut down if you hear metallic sounds.
  • Check for leaks around all gaskets, fuel lines, and coolant hoses. Use a piece of cardboard under the car to spot any drips.
  • Without revving, let the engine idle until reaching operating temperature. Monitor coolant temperature and engine oil pressure on the dash.
  • Perform a short test drive in a low-speed area. Gradually increase boost by short, controlled accelerations. Avoid full-throttle runs until the engine has 50–100 miles for ring seating.
  • After the test drive, re-torque all supercharger mounting bolts and intake manifold bolts when the engine is cold.

Maintenance Tips for Your Supercharged 70Z

Supercharger systems require more frequent checks than naturally aspirated engines.

  • Oil changes: Use high-zinc oil or a quality synthetic that is recommended for forced induction. Change at twice the normal frequency (every 3,000–5,000 miles).
  • Intercooler fluid: Replace the supercharger intercooler coolant every 30,000 miles or annually. Use only the specified low-conductivity coolant.
  • Drive belt inspection: Check the supercharger belt every oil change. The roots-type blower stresses the belt; replace at first sign of cracking or glazing.
  • Spark plugs: Gap the spark plugs tighter (typically 0.030”–0.035”) per Edelbrock recommendations. Replace them every 30,000 miles.
  • Fuel system: Use only premium fuel (91 octane or higher). If you hear pinging, reduce boost immediately and verify the tune.

Common Installation Mistakes to Avoid

Even experienced builders can overlook details. Avoid these pitfalls:

  • Failing to fully drain the intercooler coolant before disconnecting hoses, leading to a mess and coolant contamination.
  • Overtightening the supercharger mounting bolts, which can crack the manifold or strip threads.
  • Forgetting to reinstall the knock sensor or grounding straps, causing CEL and poor performance.
  • Using the wrong length belt or not routing it correctly – double-check with the Edelbrock diagram.
  • Skipping the break-in procedure. Drive gently for at least 100 miles before allowing sustained high boost.

Conclusion

Installing the Edelbrock E-Force Stage 2 Supercharger on your 70Z is a transformative upgrade that rewards careful preparation and attention to detail. By following this expanded guide and the manufacturer’s instructions, you can achieve a reliable, high-performance setup that will deliver thrilling driving for years. Remember that tuning is not optional – invest in a quality calibration to protect your engine and maximize the kit’s potential. For ongoing support, join the 70Z forced induction forum community and refer to Edelbrock’s technical support page for updates. Enjoy the new power, and drive safely.