This procedure addresses a common misunderstanding: the 1966 Chevrolet Corvette 327ci V8 was not originally equipped with a knock sensor from the factory. This guide explains the anachronism and provides guidance for those encountering this job code in error.

Warnings

Preparation

1. Verify that this vehicle has not been retrofitted with an aftermarket electronic fuel injection system that includes knock sensing capability
2. If the vehicle has a factory carburetor and points/electronic ignition, no knock sensor exists to replace
3. If diagnosing engine knock, prepare to check ignition timing with a timing light and verify fuel octane rating meets or exceeds manufacturer recommendations

Procedure

1. 1

   Verify engine configuration
   Confirm the engine retains its original carburetor setup (typically Rochester 4-barrel) and either points-type distributor or factory electronic ignition conversion. The factory 1966 327ci V8 used mechanical ignition timing advance curves and had no electronic engine management components that would include a knock sensor.
2. 2

   Inspect for aftermarket modifications
   Check if the vehicle has been retrofitted with an aftermarket EFI system such as Holley, FAST, or Edelbrock Pro-Flo. These systems may include knock sensors mounted to the engine block. If present, consult the aftermarket system's installation and service manual for sensor location and replacement procedures specific to that system.
3. 3

   Address actual engine knock concerns
   If investigating this job due to audible engine knock or detonation, the proper diagnostic path involves: checking base ignition timing (factory specification varies by engine code, typically around 8 degrees BTDC for hydraulic-lifter engines and higher for solid-lifter high-performance engines — verify against the factory service manual), verifying distributor mechanical and vacuum advance operation, confirming fuel octane rating is appropriate for compression ratio, inspecting for carbon deposits in combustion chambers, and checking for vacuum leaks or incorrect carburetor jetting.

Reassembly

1. No reassembly required for factory-equipped vehicles as no knock sensor exists to remove or replace

Verification

• Confirm engine configuration matches factory specifications for 1966 Corvette 327ci V8
• If aftermarket EFI system is present, verify knock sensor replacement per that system's documentation
• If addressing engine knock, verify ignition timing is set to specification and engine operates without detonation under load

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