Edelbrock 3550 User Manual page 23

12. When the drive gear is installed, the shutter wheel teeth must be deep enough into the Hall effect
sensor to allow them to completely pass through the sensor at the proper depth, but not so deep as to
make contact with the sensor. On small cap distributors, the provided spacer must be used to provide
correct spacing for the shutter wheel. On large cap distributors, diamond-shaped shims are provided to
allow for adjusting shutter wheel height.
13. Install the drive gear, shims, and roll pin to the bottom of the distributor shaft. Shaft end play should be
.015" to a maximum of .030".
14. Hand turn the rotor in the distributor to make sure that the shutter wheel is deep enough into the sensor that no binding occurs, and to check
for correct clearance between the shutter wheel teeth and the sensor. Shutter wheel teeth should not come up out the tapered area of the
sensor.
15. If clearance is correct, drop the rotor over the screen studs and fasten with supplied lock washers and nuts. Thread sealing compound is
recommended as added insurance.
16. When installing the shutter wheel and re-attaching the rotor, check that when rotated clockwise the leading edge of the narrow shutter
wheel tooth is centered in the Hall effect sensor when the rotor is pointing to the Number One cylinder position.
17. Be sure to test your distributor as described on the following page prior to re-installation.
SMALL CAP DISTRIBUTOR CONVERSION
Adapting a small cap distributor to the Pro-Flo Hall effect system requires a few additional steps in the
conversion. Note: Some cast iron distributors will require modification to fit the Hall effect sensor
plate. You will need to use a mill or die grinder to remove material as needed.
1. The Hall effect sensor mounts with different fastening holes on a small cap distributor. Refer to the
photo with Step 8 above for correct sensor position.
2. The small cap distributor requires the installation of the provided spacer above the shutter wheel.
Refer to the photo at Step 11 above.
3. To use the shutter wheel on small cap distributors, it is necessary to first file the stud
holes of the shutter wheel to fit with the provided fasteners. The holes must be filed
approximately 0.030-inch. As shown at right. This modification provides clearance
between the fillister screw heads and the teeth next to these slots. On some small cap
distributors the head of these screws may have to be filed to clear the top of the hall
sensor.
4. In order to use the Pro-Flo system with a small cap distributor, or any distributor utilizing
an external ignition coil, it is necessary to modify the 3-foot ignition amplifier harness.
Refer to page 23, the MAIN SYSTEM HARNESS section of this manual for details.
Rev. 10/05
Shutter wheel
tooth and sensor
Alignment.
23
Pro-Flo EFI Installation Instructions
File to fit
Shutter Wheel
File to fit
Spacer
©2005 Edelbrock Corporation
Brochure No. 63-0115