ignition

Ignition Control Module

for 1966 Chevrolet Corvette 327ci V8 · RWD

Difficulty

Easy

Time

1.4 h

Tools

Steps

This procedure addresses a common misconception: the 1966 Corvette 327 V8 uses a traditional points-based distributor ignition system and does not have an electronic ignition control module. This guide explains the system architecture and directs to the correct service procedure.

Warnings

ℹ️The 1966 Corvette 327 V8 was manufactured before electronic ignition control modules became standard. This vehicle uses a conventional breaker points distributor system.

⚠If an aftermarket electronic ignition conversion kit has been installed on this vehicle, refer to that manufacturer's specific service documentation.

Preparation

Verify the year and ignition system type on the vehicle you are servicing
Inspect the distributor to confirm whether the original points-based system is present or if an aftermarket electronic conversion has been installed
If an aftermarket electronic ignition is present, obtain the manufacturer's documentation before proceeding

Procedure

1
Identify the ignition system type
Open the hood and locate the distributor at the rear of the intake manifold on this small-block V8. Remove the distributor cap by releasing the two bail-style spring clips. Inspect the interior of the distributor. An original 1966 system will have breaker points, a condenser, and a centrifugal advance mechanism visible beneath the rotor. If you see a magnetic pickup, reluctor wheel, or external control module, an aftermarket electronic ignition has been retrofitted.
2
Determine the correct service procedure
If the original points-based ignition system is present, the correct service procedures are: distributor cap and rotor replacement, breaker points and condenser replacement, ignition timing adjustment, or complete distributor rebuild/replacement. There is no ignition control module to service on the factory 1966 system.
3
Service aftermarket electronic ignition if present
If an aftermarket electronic ignition conversion kit is installed (such as Pertronix Ignitor, Accel, Mallory, or similar), the module is typically mounted inside the distributor body or externally on the firewall or inner fender. Consult the specific manufacturer's instructions for module replacement procedures, as mounting methods, connector types, and adjustment procedures vary significantly between brands.

Reassembly

This procedure is informational only and does not involve disassembly

Verification

Confirm the ignition system type matches the service procedure being performed
If performing points service on the original system, verify ignition timing is set to factory specification after service
If servicing an aftermarket electronic ignition, verify the module is properly grounded and all connectors are secure