ROCHESTER CARBURETORS

Bulletin 9C-327 15 January 1958

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Rochester Carburetors 1958 CHEVROLET
TRIPLE TWO BARREL CARBURETOR INSTALLATION ADJUSTMENTS AND SPECIFICATIONS
BULLETIN 9C-327
PAGE 5 OF 5 DATE: 1/15/58
For basic operation and description of systems, refer to Bulletin 9 D-10-57A.
QUICK REFERENCE SPECIFICATIONS
FRONT
CENTER
CENTER
REAR
TUNE-UP
CARBURETOR No.
7011951
7012503 Syn.
7011952 A.T
7011953
7012851
7012853
SMALL VENTURI

 

1/8"

1/8"
1/8"
1/8"
LARGE VENTURI
1-1/4"
1-3/16"
1-3/16"
1-1/4"
MAIN METERING JETS
.063
.061
.059
.055
Spark Plug Gap—.035"
IDLE NEEDLE HOLES
—
.046
.040
—
SEC.
LOWER
—
.033
.028
—
Breaker Point Gap—.016"
DISCHARGE
MIDDLE
—
.029
.029
—
Cam Dwell—28ฐ-32ฐ
HOLES
UPPER
—
.035
.032
—
Ignition Timing 4ฐ BTDC Idling R.P.M.—A.T. 425 Dr.
SPARK DRILLINGS
—
[2] .040
(2) .040
—
PUMP JETS
.030
.026
.026
.030
POWER RESTRICTIONS
—
.048'
.051
—
Syn. 475 Neut.
CHOKE
CHANNEL
—
.089
.089
—
RESTRICTIONS
BY-PASS
—
.040
.040
—
IDLE TUBE RESTRICTION
—
.029
.031
—
ADJUSTMENTS
DIMENSION
DIMENSION
DIMENSION
DIMENSION
GAUGE No.
FLOAT LEVEL
1-5/16"
1-1/4"
1-1/4"
1-5/16"
Center Carburetor BT-129 Front & Rear Carburetor BT-136
FLOAT DROP
1-29/32"
1-29/32"
1-29/32"
1 -29/32"
BT-129 or Scale
PUMP ROD
15/16"
15/16"
15/16"
15/16"
BT-136
VACUUM SWITCH
—
(.031) 1/32"
(.031)1/32"
—
Feeler Gouge or Scale
AUTOMATIC CHOKE
INDEX
INDEX
CHOKE ROD
—
.089
.089
—
BT-108
UNLOADER
—
.360
.360
BT-108
CHOKE LOCKOUT
.030
—
—
Feeler Gauge
CHOKE CONTOUR
.015
—
—
—
Feeler Gauge
 
 
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
Rochester Carburetor
A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
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CO, WD, 131, 149, 9X, 9FR, 9FD
FORM NO. 1255 I.P.5.
PRINTED IN U.S.A.

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