Carb Identity Road

Annular booster How to identify your Road Demon How to determine your Road Demon’s part number. Your Road Demon will have at least seven or as many as ten numbers to form its complete part number. Fill in the rectangles below with the correct numbers. 1 2 3 4 5 6 7 8 9 10 Road Demon - Top View 5-1/4”air cleaner Number T ype of Booster Size 6 + dimple A nnular + Straigh t b ooster 525 6 + di mp le Do wn le g + Strai gh t bo os te r 62 5 7 + di mp le Do wn le g + Strai gh t bo os te r 72 5 Downleg booster 5/16 - 18tpi 1. All Road Demons begin with the part number four as the first digit. Fill in the first rectangle with: 4 2. For the next four digits, 2-5, locate the number that is cast on top of the main body next to the secondary vent tube. If the number is 6 with a “dimple”, fill in rectangles 2-5 with: 2820 If the number is 7 with a “dimple”, fill in rectangles 2-5 with: 4020 3.For the next two digits, 6-7, look in the center section of the carburetor and determine which combination of boosters are used. The photograph (above right) shows an annular booster , a straight booster, and a downlegbooster. If the boosters are the annular + straight type, fill in rectangles 6-7 with: 20 If the boosters are the downleg + straight type, fill in rectangles 6-7 with: 10 4. All Road Demons are vacu um-operated. Fill in digit eight with: V 5. Does the carburetor have a Ford kickdown linkage? If YES, rectangle 9 will be: F and if a choke is present, rectangle 10 will be either: E (for Electric) or M (Manual choke) If NO, yet it has a choke, rectangle 9 will be either: E (for Electric) or M (Manual choke) and, if there is a single inlet fitting with a cross-over vent tube (see right), rectangle 10 will be: T for Trucker Series or W for Whip Series. Demon Whips have gold accents. 6. If no choke is present, is there a vacuum fitting located in the baseplate, directly under the center of the fuel bowl (as shown)? If YES, fill in rectangle 9 with: B Straight booster The Road Demon is a four-barrel carburetor with vacuum- operated secondary throttle plates. It can be recognized by i ts vacuum pod and its choke tower and choke mechanism. The Road Demon is available with either an electric or manual choke. The size of this carburetor can be identified by a single digit cast into the main body and also by the style of the boost venturii. To determine carburetor size, look for a single digit cast into the main body adjacent to the secondary vent tube and also the type of boost venturii (booster) employed. The cast digit will be 6 or 7, with a dimple, and the boosters will be either annular or down leg in the primary venturii and straight leg in the secondary venturii. The Demon Whip with gold accents Road Demon

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8/3/2019 Carb Identity Road

http://slidepdf.com/reader/full/carb-identity-road 1/1

Annular booster

How to identify your Road Demon

How to determine your Road Demon’s part number.Your Road Demon will have at least seven or as many as ten numbers to form its

complete part number. Fill in the rectangles below with the correct numbers.

1 2 3 4 5 6 7 8 9 10

Road Demon - Top View 5-1/4”air

cleaner

Number Type of Booster Size6 + dimple Annular + Straight booster 5256 + dimple Downleg + Straight booster 6257 + dimple Downleg + Straight booster 725

Downleg booster

5/16 - 18tpi

1. All Road Demons begin with the part number four as the first digit. Fill in the first rectangle with: 4

2. For the next four digits, 2-5, locate the number that is cast on top of the main body next to the secondary vent tube.

If the number is 6 with a “dimple”, fill in rectangles 2-5 with: 2820

If the number is 7 with a “dimple”, fill in rectangles 2-5 with: 4020

3.For the next two digits, 6-7, look in the center section ofthe carburetor and determine which combination of boostersare used. The photograph (above right) shows an annular booster,a straight booster, and a downlegbooster.

If the boosters are the annular + straight type, fill in rectangles 6-7 with: 20

If the boosters are the downleg + straight type, fill in rectangles 6-7 with: 10

4. All Road Demons are vacuum-operated. Fill in digit eight with: V

5. Does the carburetor have a Ford kickdown linkage?If YES, rectangle 9 will be: F and if a choke is present, rectangle 10 will be either: E (for Electric) or M (Manual choke)If NO, yet it has a choke, rectangle 9 will be either: E (for Electric) or M (Manual choke) and, if there is a singleinlet fitting with a cross-over vent tube (see right), rectangle 10 will be: Tfor Trucker Series or W for Whip Series. Demon Whips have gold accents.

6. If no choke is present, is there a vacuum fitting located in the baseplate,directly under the center of the fuel bowl (as shown)?If YES, fill in rectangle 9 with: B

Straight booster

The Road Demon is a four-barrel carburetor with vacuum-operated secondary throttle plates. It can be recognized by itsvacuum pod and its choke tower and choke mechanism. The Road Demon isavailable with either an electric or manual choke. The size of this carburetorcan be identified by a single digit cast into the main body and also by thestyle of the boost venturii.

To determine carburetor size, look for a single digit cast into themain body adjacent to the secondary vent tube and also the type of boostventurii (booster) employed. The cast digit will be 6or 7, with a dimple, and the boosters will be eitherannular or down leg in the primary venturii andstraight leg in the secondary venturii.

The DemonWhip

with gold accents

Road Demon