ROCHESTER CARBURETORS

Bulletin 9D-8-57

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BULLETIN 9D-8-57
12-1-56
FILE AFTER 9D-8 BC-BASIC MODEL MANUAL
ROCHESTER CARBURETORS
MODEL BC 1957 DESIGN CHANGES
ROCHESTER PRODUCTS
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APPLICATION
CHEVROLET
Syncromesh "6" — 7009657 Powerglide "6"— 7005656
G.M. of CANADA
Pontiac "6" Syncromesh — 7010516 Pontiac "6" Powerglide — 7010517
DESCRIPTION OF CHANGES APPEARANCE:
The Model BC Carburetors for 1957 incorporate a new low air horn design, to facilitate lower hood styling. Along with decrease in height, air horn con­struction has been altered to include ,a center stud hole for simpler and more positive air cleaner mounting ing. A larger fuel inlet is used with a pressed bead type strainer installed under the fuel inlet nut. The new type strainer can be easily removed for cleaning and will give improved fuel filtering,
OPERATION:
A new type power piston is used this year with a solid stem for more support to eliminate any possi­bility of the end flaring.
With the exception of minor calibration changes to meet new engine requirements the carburetors are the same in operation and adjustment as the 1956 Models.
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QUICK REFERENCE ADJUSTMENT SPECIFICATIONS
ADJUSTMENT
DIMENSION
TOOL No.
AUTOMATIC CHOKE SETTINGS
Float Level Float Drop Choke Rod Unloader
1-9/32" 1-3/4" .076 .230
M-250 Scale BT-99 BT-99
7009657—Syncromesh ...........................1 Notch Rich 7009656—Powerglide .............................2 Notch Lean 7010516—G.M. of Canada (Syncromesh)....Index 7010517—G.M. of Canada (Powerglide) .....Index
CO, WO, 131, 132:1-2-9-12-16, 9X, 9FR
Printed in U.S.A. R. P. Form No. 1211 I.P.S.

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