ROCHESTER CARBURETORS Bulletin 9D-8-57
		BULLETIN 9D-8-57 12-1-56 FILE AFTER 9D-8 BC-BASIC MODEL MANUAL
		ROCHESTER CARBURETORS MODEL BC 1957 DESIGN CHANGES
	ROCHESTER PRODUCTS
	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.
	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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