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Edelbrock Performer Series Carburetor Owner’s Manual 9/01
altitude, however, and is to be driven at high altitude temporarily, it is not necessary to repeat the
complete calibration procedure. Instead, use the rule of: “2% leaner per 1500 feet” and the
Calibration Reference Chart for your model carburetor. For example, with a #1405 at baseline
calibration (location #1 on the chart) and intended operation at 6000 ft. altitude, you would want 6000
divided by 1500 x 2% = 8% leaner calibration. That would be location #24 on the chart which would
require only a rod and jet change.
Blended Fuels
Typically, two types of blended fuels are available: Gasohol and gasahol. Gasohol is a blend of not
more than 10% ethanol and gasoline. As long as there is no more than 10% ethanol mixed with the
gasoline you carburetor will function properly. As the percentage of ethanol climbs above10%, a
richer A/F ratio will be required. Also, because gasohol is more volatile than gasoline, hard hot starting
and poor hot weather driveability may result.
Gasahol can be a blend of either ethanol, methanol or other alcohol with gasoline. Methanol blended
fuel should not be used in your Edelbrock Performer Series carburetor as it will cause corrosion of the
fuel system components. It can also cause rapid failure of seals, gaskets, diaphragms and pump
plungers.
Always check to see if you are using a blended fuel. Although the pump may not indicate the fuel is
blended, it is always advisable to verify the type of fuel the station carries.
Blown Engines
Two model #1405 carburetors should be used on engines with positive displacement superchargers,
such as GMC 6-71 blowers or equivalent. The following calibration changes make an excellent
starting point: Primary Jets - .101" (#1429); Secondary Jets - .101” (#1429); Metering Rods - .070" x
.042" (#1450); Step-up Piston Springs - 5" (orange, stock); Needle & Seat assemblies - .110"
(#1466).
This calibration has been tested on engines ranging in size from 350 c.i.d. Chevys to 440 c.i.d.
Chryslers with good results.
Float Pump Drive Accelerator Venturi Venturi Throttle Bore Throttle Bore
Drop Link Pump Diameter Diameter Diameter Diameter
(±1/4") Location Nozzle Diameter Primaries Secondaries Primaries Secondary
1-1/4" middle hole .028" 1-3/16" 1-9/16" 1-7/16" 1-11/16"
1-1/4" middle hole .028" 1-3/16 " 1-9/16" 1-7/16" 1-11/16"
1-1/4" middle hole .031" 1-3/16 " 1-9/16" 1-7/16" 1-11/16"
1-1/4" top hole .035" 1-7/16 " 1-9/16" 1-11/16" 1-11/16"
1-1/4" middle hole .028" 1-3/16 " 1-9/16" 1-7/16" 1-11/16"
1-1/4" top hole .035" 1-7/16 " 1-9/16" 1-11/16" 1-11/16"
1-1/4" top hole .035" 1-7/16 " 1-9/16" 1-11/16" 1-11/16"
1-1/4" top hole .035" 1-17/32 " 1-5/8" 1-3/4" 1-3/4"
1-1/4" top hole .035" 1-17/32 " 1-5/8" 1-3/4" 1-3/4"
Carburetor Specifications (continued)
1403-1413 Perf Series Carburetor Owner's Manual.qxd 3/31/2006 12:10 PM Page 17