ROCHESTER CARBURETORS

Bulletin 9C-327 15 January 1958

tmp23A-1.jpg
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
tmp23A-2.jpg
tmp23A-3.jpg
CO, WD, 131, 149, 9X, 9FR, 9FD
FORM NO. 1255 I.P.5.
PRINTED IN U.S.A.

< PREVIOUS PAGE      NEXT PAGE >

 

RC INDEX

 

More Old Online Chevy Manuals & Info

 

WebCounter says that you are visitor number: 

Please Report any Broken Links or Pages that do not load properly.  Webmaster

This Information is for Research and the Promotion of the Preservation of Older Chevys

All Names, Trademarks and Logos Belong to their Respective Owners.

 Nedstat Basic - Free web site statistics

Web Space Provided by TOCMP