ROCHESTER CARBURETORS

Bulletin 9C-311 15 February 1957

BULLETIN 9C-311
PAGE 4OF4
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UNLOADER ADJUSTMENT
SETTING: 1955-56 - .360" -GAUGE, BT-108
With the throttle valves held wide open, the choke valve should be open just enough to admit the large end of Gauge BT-108, Dimension .360", between the upper edge of the choke valve and the inner air horn wall. To adjust, bend the tang on the throttle lever as shown with Bending Tool BT-69.
THROTTLE VALVES WIDE OPEN
QUICK REFERENCE
SPECIFICATIONS
CARBURETOR No.
7005810
7006825
7008004
7008005
7008387
7008388
SMALL VENTURI
1/8"
1/8"
1/8"
1/8"
1/8"
1/8"
LARGE VENTURI
1-3/32"
1-3/32"
1-3/32"
1 -3/32"
1-3/32"
1-3/32"
MAIN METERING JETS
.052
.053"
.051
.052
.052
.052
IDLE NEEDLE HOLES
.040
.040
.040
.040
.040
.040
SEC. DISCHARGE HOLES
LOWER
.0285
.028
.0285
.028
.030
.028
MIDDLE
.0265
.026
.0265
.026
.0255
.026
UPPER
.0325
.028
.0325
.028
.030
.032
SPARK DRILLINGS
.040(2)
.040(2)
.040(2)
.040(2)
.040(2)
.040(2)
PUMP JETS
.028
.026
.026
.026
.026
.026
POWER RESTRICTIONS
.037
.037
.0335
.0335
.029
.038
CHOKE
CHANNEL
.089
.089
.089
.089
.089
.089
RESTRICTIONS
BY-PASS
.040
.040
.040
.040
.040
.040
IDLE TUBE RESTRICTIONS
.028
.030
.028
.030
.029
.028
ADJUSTMENTS
1955
1956
DIMENSION
GAUGE No.
DIMENSION
GAUGE No.
FLOAT LEVEL
1-5/32"
BT-107
1 74"
BT-129
FLOAT DROP
1-29/32"
BT-107
1-29/32"
BT-1 29
PUMP ROD
15/16"
BT-1O7
57/64"
BT-129
AUTO CHOKE
INDEX
IINDEX
CHOKE ROD
.089
BT-108
.089
BT-108
UNLOADER
.360
BT-108
.360
BT-108
TUNE-UP
1955
1956
SPARK PLUG GAP
.035"
.035"
BREAKER POINT GAP
.016"
.016"
CAM DWELL
26° - 33°
26°-33°
IGNITION TIMING
4° B.T.C. @ IDLE
4° B.T.C. @ IDLE
IDLE R.P.M.
STANDARD—475 NEUTRAL
STANDARD—475 NEUTRAL
POWERGLIDE—425 DRIVE
POWERGLIDE—425
DRIVE
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CARBURETOR TOOLS AND GAUGES LISTED ARE AVAILABLE THROUGH UNITED MOTOR SERVICE
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Rochester Carburetor
A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
FORM 1228 l.P.S.
PRINTED IN U.S.A.

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