Edelbrock 3550 - Manual (Page 21)

21
Pro-Flo EFI Installation Instructions
©2005 Edelbrock Corporation
Brochure No. 63-0115 Rev. 10/05
IGNITION SYSTEM
A new distributor is not required with the Edelbrock Pro-Flo system. The system has been designed to allow you to convert your stock
distributor, large cap or early small cap, mechanical or computer-controlled, into a Multi-Port Fuel Injection compatible Hall effect electronic
distributor. Optional conversion distributor bodies are the MSD #8365 and Accel #9109. A Mallory #6148201 may be used as is, without
performing the conversion.
HALL EFFECT SENSOR
A Hall effect distributor operates with a sensor that generates a pulse train
indicative of engine position and speed. This type of distributor is required for
sequential fuel injection, and also provides high ignition timing accuracy. The Pro-
Flo system includes everything you need for this distributor conversion. The
conversion is a simple matter of disassembling your stock distributor and installing
the Hall effect sensor, sensor plate, and shutter wheel provided with the package.
Since the ECU controls spark advance, a mechanical advance lock-out plate is
provided as well.
SHUTTER WHEEL
The Hall effect shutter wheel is designed with seven wide shutter teeth and one narrow
shutter tooth. The narrow tooth indicates the Number One cylinder position, and is
necessary for the ECU to establish proper phasing of the injector firing order. For this
reason, correct installation of the shutter wheel is very important. If the shutter wheel is
installed incorrectly, the injector firing order will not begin with the Number One cylinder.
DISTRIBUTOR CONVERSION
1. Rotate the engine to 10° Before Top Dead Center (BTDC) on cylinder #1 as seen on the damper, with the
rotor pointing approximately to Number One cylinder plug wire.
2. Remove the distributor cap.
3. Remove the distributor from the engine.
4. Note position of rotor and mark the distributor housing where the rotor points to Number One cylinder.
5. Remove the roll pin from the bottom of the distributor shaft, releasing the drive gear and shims.
NOTE: Check the drive gear and oil pump drive shaft for signs of wear. Worn parts can damage the
camshaft and oil pump and should be replaced. This is especially true when a high performance oil system
is used, which generates a heavier load on the camshaft gear system.
6. Remove the rotor and distributor shaft.
NOTE: It is critical that the sensor plate fits securely in place and is level in relation to the distributor
housing.
Narrow Tooth (#1)