Edelbrock 3670 User Manual - page 54

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3.2.3.11 Oxygen Sensors

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Oxygen Sensors

Figure 21

Installing / Replacing Oxygen Sensor(s)

The exhaust gas oxygen content is determined by the oxygen sensor. The sensor signals

the ECU, which compensates when the air/fuel mixture is either rich or lean. If the

exhaust system is already configured for an oxygen sensor port, simply replace existing

sensor with the Edelbrock 4 wire sensor. Route and secure wire and connector away from

exhaust heat. Allow enough slack for exhaust pipe movement.

If your exhaust system does not have an O2 port, you will need to weld the included

threaded bung into the exhaust pipe.  See Figure 21.

It is recommended that the O2 sensor installation be performed by

a professional muffler shop.

1. Double check header gaskets, replacing if necessary.

2. Drill a 1/2-inch to 9/16-inch hole in the driver-side header collector reducer, as

close to the engine as possible in the header collector (1" to 3" forward of flange

minimum)

NOTE:

 Before drilling, make sure the O2 sensor will be mounted at a slight

downward angle in the top half of the exhaust pipe and within reach of the harness

connector. Check to insure adequate clearance for the sensor, taking into

consideration engine movement.