Chevrolet 1963 Corvette, Руководство по ремонту и настройке

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162 EMISSION CONTROLS AND FUEL SYSTEM
Holley 2300 secondary carburetor
the 427 engine from 1967 through 1969. This
configuration uses one 2300C as the primary
carburetor and two 2300 models as the two
secondary units. The two models differ in that
the C model contains the choke, power, and
accelerator pump systems while the straight
2300 does not. The C model is operated
through conventional linkage while the two
secondaries are vacuum actuated.
ACCELERATOR PUMP ADJUSTMENT-
PRIMARY CARB
Secure the throttle plate fully open and de-
press the pump lever, fully. Gauge the dis-
tance between the pump lever arm and the
spring adjusting nut. Turn the nut or screw
to adjust. The slightest movement of the
throttle lever will actuate the correctly ad-
justed pump lever.
IDLE ADJUSTMENT
Adjust the idle-speed screw until it touches
the throttle lever. Add one and
Yz turns to
obtain the preliminary adjustment.
Fast-idle adjustment on the primary car-
buretor is made as follows: crack the throttle,
and with the choke closed, place the fast-idle
lever against the top step of the fast-idle cam.
Bend the fast-idle lever so that the specified
opening of the throttle plate on the idle
transfer slot of the carburetor is achieved.
FLOAT LEVEL ADJUSTMENT
Position the car on a flat, level surface and
start the engine. Remove the sight plugs and
check to see that the fuel level reaches the
bottom threads of the sight plug port. A plus
or minus tolerance of Vaz in. is acceptable.
To change the level, loosen the fuel inlet-
needle locking screw and adjust the nut.
Clockwise lowers the fuel level and counter-
clockwise raises it. Turn the nut Vie of a turn
for each Vie in. desired change. Open the
primary throttle slightly to assure a stabilized
adjusting condition on the secondaries. There
is no required float drop adjustment.
VACUUM BREAK ADJUSTMENT-
PRIMARY CARB
Secure the choke valve closed and restrain
the vacuum break against its stop. Bend the
break rod to achieve the specified measure-
ment between the lower edge of the choke
valve and the body.
1. Carburetor body 5. Fuel bowl assembly
2. Metering body gasket 6. Vacuum break
3. Metering body
7. Throttle body gasket
4. Fuel bowl gasket 8. Throttle body
Primary carburetor components
CONNECTION TO
-PRIMARY
<CARBURETOR