Owners manual

6
Figure 8
C. MAINTENANCE:
WARNING: Fuel systems components, which are required to operate under severe conditions, such as high underhood temperatures
should be periodically inspected to assure no fuel leakage and the soundness of hoses. High temperatures promote faster aging of non-
metallic materials.
Hoses that exhibit surface cracks when bent 180°, should be replaced. The presence of liquid fuel demands retightening of loose fittings,
hose replacement (when needed), and a retorquing of fuel system component flange nuts (where applicable). Tightening of the carburetor
fuel bowl screws should provide 25-30 in/lbs of torque in a clockwise direction. Periodically recheck bowl screw torque to assure proper
fuel metering. Inadequate bowl screw torque is often characterized by a condition similar to a defective power valve (i.e., black smoke from
the exhaust at idle and cruise).
D. AIR CLEANER CONFIGURATION: Unrestricted air cleaners featuring paper elements of the largest possible diameter and height are
recommended for peak performance. It is mandatory that there is a 3/4” minimum clearance between the top of the carburetor vent tubes
and the inside of the air cleaner. Any clearance less than this can result in improper fuel metering and unsatisfactory performance.
E. JETTING: Out of the box jetting will be extremely close for most single four-barrel applications. Large plenum manifolds will require larger
jetting (3 to 4 numbers larger). Tunnel ram manifolds (dual-quad applications) might require jets as much as five sizes larger than stock.
When in doubt, jet larger to start. It is cheaper to foul a set of spark plugs than to burn a piston.
GENERAL: Besides your replacement carburetor, the correct engine timing, spark plug gap, and heat range, sound primary and secondary
wiring, correct valve lifter adjustment, operational PCV, EGR, and heat riser systems are all important in order to obtain optimum
efficiency and performance from your engine.
No automotive system can perform to its maximum potential without proper maintenance and adjustment of all its components.
For additional information, consult HOLLEY CARBURETORS and MANIFOLDS (M.P. Books, Holley P/N 36-73).
Holley® Performance Products, Inc.
1801 Russellville Road
Bowling Green, KY 42101
Technical Service: 1-866-GOHOLLEY
Phone: [phone]
Fax: [phone]
For online help, please refer to the Tech Service section of our website: www.holley.com
© 2000 Holley Performance Products, Inc. All rights reserved.
199R7923-2
Revision Date: 1-23-12