Introduction to the Edelbrock E85 System for the 5.7L Camaro

The Edelbrock E85 system has become a go-to upgrade for owners of the 5.7L Camaro who want to unlock extra horsepower without the complexity of forced induction or internal engine modifications. E85 fuel – a blend of 85% ethanol and 15% gasoline – offers a higher octane rating (typically around 105–110) and a significant cooling effect that allows modern engines to run more aggressive timing and fueling strategies. Edelbrock, a name synonymous with aftermarket performance since the 1930s, created this conversion kit specifically to help LS-based engines (including the 5.7L found in 1997–2004 Camaro SS and Z28 models) take full advantage of E85’s properties. This article provides a detailed cost breakdown, power gain analysis, installation walkthrough, and practical considerations so you can decide whether this upgrade fits your Camaro build.

Understanding E85 Fuel and Its Performance Potential

Ethanol-based fuels are not new to motorsports, but E85 has entered the mainstream as a street-legal high-octane alternative. The key advantages of E85 over pump premium (91–93 octane) include:

  • Higher knock resistance – allows more spark advance and higher boost levels without detonation.
  • Charge cooling – ethanol’s high latent heat of vaporization cools the incoming air-fuel mixture, increasing air density and power.
  • Cleaner burn – ethanol is oxygenated, reducing carbon deposits.

However, E85 also has trade-offs. Its energy content is roughly 30% lower than gasoline by volume, so fuel economy drops significantly. Cold-start behavior can be challenging in sub-freezing temperatures, and ethanol is more corrosive to certain metals and elastomers. Many factory fuel systems (especially older ones) require upgrades to ethanol-compatible components. Edelbrock’s E85 system addresses these issues with a complete conversion kit that replaces injectors, pump, lines, and engine management calibration.

Edelbrock E85 System Components in Detail

The Edelbrock E85 conversion kit for the 5.7L Camaro (part number 3600 for LS engines) includes the following main items:

High-Flow Fuel Injectors

The kit comes with 36 lb/hr injectors (rated at 43.5 psi) that flow enough fuel to support the added volume required when running E85. Because ethanol requires roughly 30% more fuel volume to achieve the same air-fuel ratio, these injectors are critical. Edelbrock uses Bosch-style injectors with ethanol-compatible seals and internals.

Fuel Pump Module

A new in-tank or inline fuel pump is included, often a Walbro 255 LPH unit or Edelbrock-branded equivalent. This pump ensures adequate fuel pressure and volume even at wide-open throttle. The kit also includes a new fuel pump strainer and installation hardware.

Fuel Lines and Fittings

Edelbrock supplies a length of PTFE-lined stainless-steel braided hose and the necessary AN fittings to connect the pump to the rail. PTFE lining is alcohol-resistant and prevents the permeation and corrosion that occurs with rubber-lined hoses when using ethanol.

Engine Management Software and Calibration

The system includes Edelbrock’s Pro-Flo 4 or a custom calibration for the factory PCM (depending on the specific kit). For vehicles with a stock computer, Edelbrock provides a handheld programmer that uploads a base E85 tune. For those using an aftermarket ECU, the calibration data is available as a downloadable file. The tune adjusts injector pulse width, spark timing, and cold-start enrichment for optimal E85 operation.

Optional components (not always included but often purchased) are a flex fuel sensor and harness, which allows the PCM to automatically adjust between gasoline and ethanol blends. This adds versatility but increases total cost.

Total Cost Breakdown: Parts, Labor, and Extras

The following cost breakdown is based on current retail prices (2025) and typical labor rates from a reputable performance shop. DIY installation can save on labor, but professional tuning might still be needed.

Item Estimated Cost
Edelbrock E85 Conversion Kit (injectors, pump, lines, tune) $1,200 – $1,350
Flex Fuel Sensor Kit (optional) $150 – $250
Additional Hoses, Fittings, Clamps (if needed) $50 – $150
Professional Installation Labor (6–8 hours) $400 – $800
Dyno Tune Session (if not satisfied with base calibration) $400 – $600
Miscellaneous (coolant, fuel, shop supplies) $50 – $100
Total Range $2,250 – $3,250

If you install the kit yourself and use the provided base tune, you can stay near the lower end. Many owners, however, find that a custom dyno tune extracts the most power and drivability, pushing the total closer to $3,000. Compared to a supercharger kit ($5,000+ installed) or a cam swap with supporting mods ($2,500+ excluding labor), the Edelbrock E85 system offers a relatively affordable horsepower-per-dollar ratio.

Installation Process: What to Expect

Installing the Edelbrock E85 system on a 5.7L Camaro is a weekend-level job for a moderately skilled mechanic. Professional shops typically quote 6–8 hours. Here is the step-by-step sequence:

Step 1: Fuel System Depressurization and Removal

Disconnect the battery, relieve fuel pressure at the service port, and drain the tank if needed. Remove the factory fuel pump module from the tank (access through the trunk floor on fourth-gen Camaros). Remove the intake manifold to access the stock fuel injectors and fuel rail.

Step 2: Install the New Fuel Pump and Sender

Drop the new pump module into the tank, making sure the wiring and hoses are routed cleanly. For some kits, you may need to cut and re-flare hard lines if converting from a returnless system. Edelbrock provides clear instructions and templates for this.

Step 3: Install the New Fuel Rails, Injectors, and Lines

Assemble the supplied fuel rail with the new injectors, using new O-rings. Run the PTFE lines from the pump to the rail, and from the rail to a fuel pressure regulator (if external) and return line. Use AN wrenches to tighten fittings – do not overtighten.

Step 4: Engine Management Updates

If you are using the Edelbrock Pro-Flo 4 ECU, installation involves mounting the ECU, connecting the main harness, and uploading the E85 calibration. For factory PCM vehicles, use the handheld programmer to flash the new calibration. Verify that the PCM recognizes the new injector flow rate and adjusts VE tables.

Step 5: Inspection and Testing

Reconnect the battery, prime the fuel system (turn key to ON, wait for pump to pressurize, check for leaks). Start the engine and let it idle to operating temperature. Drive gently while monitoring air-fuel ratio and checking for any codes. A professional shop will also perform a road test and WOT pull.

Real-World Power Gains: Dyno Results

On a typical 5.7L LS1 Camaro (with stock heads and cam), switching from premium pump gas to E85 with the Edelbrock system yields:

  • Horsepower: +40 to +55 wheel horsepower (typically 310–320 whp stock becomes 355–370 whp with tune).
  • Torque: +35 to +45 lb-ft.
  • Throttle response: noticeably sharper, especially in the mid-range.

These gains come from the combined effect of higher octane (allowing 4–6 degrees more timing) and charge cooling. On a hotter day, the density advantage can be even more pronounced. If the Camaro already has bolt-on modifications (headers, cold-air intake, larger throttle body), the E85 kit adds about 30–40 whp on top of those gains, because the tune can be optimized further.

It is important to note that gains vary depending on the baseline calibration and the quality of the dyno tune. Edelbrock’s base calibration is conservative and safe but may leave 10–15 hp on the table. A custom tune on a Dynojet or Mustang dyno extracts the full potential.

Important Considerations Before Buying

Fuel Availability

E85 is not available at every gas station. Use an app like PureGas or E85Zip to see local availability. Some owners install a flex fuel sensor so the car can run both E85 and gasoline – this adds $200–$300 to the build but eliminates range anxiety.

Cold Start and Winter Use

E85 makes cold starts more difficult. Even with Edelbrock’s calibration, you may need to cycle the key twice on sub-40°F mornings. If you live in a cold climate, consider using a block heater or keeping the car garaged.

Maintenance and Wear

Ethanol absorbs water, so keeping the tank full and avoiding long-term storage with E85 is recommended. Fuel filters may clog more often. Use a fuel stabilizer if the car will sit for more than a month. Check your intake valve condition periodically – ethanol burns cleanly but can increase oil dilution if the engine runs rich.

Warranty and Emissions

Installing an E85 conversion kit may void factory engine warranty if still applicable. Also, E85 is not legal for use on public roads in all states unless the vehicle is certified as flexible fuel. Check local regulations. On the plus side, Edelbrock parts are backed by a limited warranty against defects.

Alternative Performance Upgrades: How E85 Compares

To give context, here is how the Edelbrock E85 kit stacks up against other common mods for the 5.7L Camaro:

  • Camshaft swap (staged from $400 to $1,200) – can yield 30–50 whp but requires valve springs, pushrods, and labor; drivability suffers with aggressive lobes. E85 adds power without changing the engine’s idle quality.
  • Supercharger kit ($5,000–$7,000) – adds 100–200 whp but demands forged internals for reliability and significantly higher cost.
  • Nitrous oxide ($600–$1,000 plus bottle fills) – cheap power but stresses the engine and requires careful tuning to avoid detonation. E85 is a safer, always-on upgrade.
  • Headers and exhaust ($1,000–$2,000) – typically 20–30 whp. Combining headers with E85 can reach 60+ whp total.

For many Camaro owners, the Edelbrock E85 system is a logical first or second step into performance tuning, especially if they have already done basic breathing mods.

External Resources for Further Reading

Final Verdict: Is the Edelbrock E85 System Worth It?

For a 5.7L Camaro owner who is willing to manage the quirks of E85 fuel, the Edelbrock system delivers proven power gains at a cost well below forced induction. The total investment of $2,300–$3,000 for 40–55 whp is excellent value, and the installation is straightforward for a DIY mechanic. If you prioritize drivability, low maintenance, and the ability to run on both fuels, a flex fuel sensor is a smart add-on. However, if you live far from an E85 pump or experience extreme cold winters, the trade-offs may outweigh the benefits. In all other scenarios, this conversion is one of the smartest upgrades you can make to wake up the LS1.