Choke Adjustment - Holley 0-80508S Installation, Tuning, And Adjustment Manual

CHOKE ADJUSTMENT:

IMPORTANT: Your Holley® carburetor has been factory wet-flowed and calibrated. The "out of the box" settings should be
very close for all adjustments. The following tuning section is included ONLY to aid you in fine tuning
adjustments.
Electric Choke
1. You can control the choke operation by rotating the choke cap. If the choke comes off too soon, rotate the cap counterclockwise
one notch at a time, until the choke operation is satisfactory. Reverse the procedure by loosening the screws, if the choke comes
off too late. The choke setting from the factory is on "index" or at center position. After making the final adjustments, start the
engine and make sure the choke plate opens completely.
A. A choke that comes off too soon could exhibit one or more of the following symptoms: stalling, surging, backfiring, stumbles,
or poor vehicle driveability when the vehicle is cold.
B. A choke that comes off too late could exhibit one or more of the following symptoms: black smoke from the tail pipe, poor
driveability when cold, poor gas mileage, misses, or rough idle.
Manual and Electric Chokes
2. If the fast idle RPM is too low or too high for your preferences, SHUT DOWN THE ENGINE! Advance the throttle to wide-open,
exposing the fast idle set screw below the choke housing (See Figure 8).
3. Using a 1/4" open end wrench, turn the screw clockwise to increase the RPM or counterclockwise to decrease the RPM. The
factory setting should give you a 1500-1600 RPM fast idle speed.
NOTE: All vacuum ports must be plugged at this time.
Figure 8
9