CARBURETOR P/N 0-7448, 0-4412C, 0-4412S, & 0-4412CT INSTALLATION, TUNING, AND ADJUSTMENT MANUAL 199R7950-7 NOTE: These instructions must be read and fully understood before beginning installation. If this manual is not fully understood, installation should not be attempted. Failure to follow these instructions, including the pictures may result in subsequent system failure.
TABLE OF CONTENTS: INTRODUCTION: .........................................................................................................................3 REMOVAL: ..................................................................................................................................3 INSTALLATION NOTES: .............................................................................................................4 CHRYSLER APPLICATIONS...............................................................
INTRODUCTION: CONGRATULATIONS on your purchase of a Holley® carburetor! We feel that you have purchased the finest performance carburetor manufactured today. Should you need information or parts assistance, please contact our Technical Service Department at 1-270-781-9741, Monday through Friday, 7 a.m. to 5 p.m. CST. Please have the part number of the product you purchased on hand when you call. NOTE: The 0-7448, 0-4412C, and 0-4412S are designed as a universal-type, 2-barrel carburetors.
INSTALLATION NOTES: CHRYSLER APPLICATIONS WARNING: This carburetor is not designed for use with any Chrysler automatic overdrive transmission. SEVERE transmission damage may result from improper application use. 1. Unless you are replacing an existing Holley® carburetor (which already has a lever extension arm), you may need to purchase and install a throttle lever extension (Holley® P/N 20-7) on the carburetor. Remove the throttle stud and nut from the original carburetor.
Figure 3—Ford applications GM APPLICATIONS WARNING: If you are using this carburetor with a GM overdrive transmission TH700R4 or a TH200R4, you must use a transmission kickdown cable bracket (Holley® P/N 20-95) and stud (Holley® P/N 20-40). Otherwise, SEVERE transmission damage WILL result. This carburetor is not designed to work with ANY other automatic overdrive transmission. 1.
4. Before connecting the linkage, operate the throttle lever to assure the correct travel (no sticking or binding), by opening to wide-open throttle and back to closed throttle several times. Correct any sticking or binding conditions before proceeding. WARNING: Any sticking, binding, or other interference in the throttle linkage could result in uncontrolled engine speed. This could result in engine damage or personal injury. 5.
Figure 7 WARNING: During the fuel line installation, DO NOT allow any foreign particles to enter the fuel lines, which could then cause flooding and may result in a fire. WARNING: Keep the fuel line away from the EGR valve (if equipped) on the intake manifold. If installation requires cutting the metal fuel line, cut the fuel line with a good tube cutter. This will minimize the chance of producing metal chip particles. If a hacksaw must be used then metal chips must be removed.
16. With some air cleaner configurations, it may be necessary to use an air cleaner spacer to provide adequate clearance between the carburetor and the air cleaner. Holley® offers such a spacer (Holley® P/N 17-13). Depending on the overall height, obtain the proper length 1/4 x 20 stud and install in the carburetor airhorn. Close the hood slowly to ensure adequate clearance between the air cleaner stud and the hood.
IDLE MIXTURE NEEDLES: Idle mixture needles control the air/fuel mixture at idle. These have been preset at the factory and SHOULD NOT need any adjustments. However, if you feel that adjustment is necessary, you can use the following procedure to do so. When tuning the idle mixture, you’re actually tuning for the best manifold vacuum. Idle mixture needles are found on the primary metering blocks. If you change one idle mixture needle, you must change the other idle mixture needle by the same amount.
FLOAT LEVEL CHECK AND ADJUSTMENT: Float adjustments are set at the factory, but variations in fuel pressure could cause a change in these settings. The following procedure shows how to make these adjustments: 1. Start the vehicle. 2. Remove the fuel bowl sight plug. 3. Observe the sight plug hole for the fuel level. If none is seen, the level is too low. Fuel should be even with the bottom of the sight plug hole. If fuel comes pouring out of the sight hole, the float is set too high.
JETTING (MAIN JETS): Due to varied applications that a universal performance carburetor will work with, a few tips on jetting are provided to help you understand their purpose. 1. Out of the box jetting is extremely close for most applications. 2. Carburetors are calibrated at 70 at sea level. Decrease the jet size primary and secondary, one number for every 2000 ft. increase in altitude. 3. Holley® jets are broached, flowed, and stamped according to flow rate.
Holley® Performance Products, Inc. 1801 Russellville Rd. Bowling Green, KY 42101 1-866-464-6553 Technical Service: 1-270-781-9741 Fax: 1-270-781-9772 Website: www.holley.com © 1999 Holley Performance Products, Inc. All rights reserved.
