Owners manual

ManualsBrandsHolley Performance ManualsAutomotive0-80541-1 HP Classic Race Carburetor

COMPETITION CARBURETORS

MODEL 4150 HP PRO-SERIES

MODEL 4150 HP ULTRA SERIES

Installation and Adjustment Instructions

CONGRATULATIONS on your purchase of 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 1-866-GOHOLLEY,

Monday through Friday, 8 a.m. to 6 p.m. CST. Please have the part number of the product you purchased on hand when you call.

WARNING! These instructions must be read and fully understood before beginning installation. Failure to follow these instructions

may result in poor performance, vehicle damage, personal injury, or death. If these instructions are not fully understood,

installation should not be attempted.

APPLICATIONS:

P/N

USE

Calibration

CFM

SECONDARIES

BOOSTER TYPE

0-80507-1

Race, NASCAR Approved

Touring Series Style Racing

390

Mechanical

Conventional

0-80540-1

Race

Gasoline

600

Mechanical

Conventional

0-80575S

Race, Supercharger

Gasoline

600

Mechanical

Conventional

0-80541-1

Race

Gasoline

650

Mechanical

Conventional

0-80528-1

Race

Gasoline

750

Mechanical

Double -step Down Leg

0-80529-1

Race

Gasoline

750

Vacuum

Double -step Down Leg

0-80535-1

Race

Alcohol

750

Mechanical

Double -step Down Leg

0-80576S

Race, Supercharger

Gasoline

750

Mechanical

Double -step Down Leg

0-80509-1

Race, NASCAR Approved

Winston Cup Style Racing

830

Mechanical

Double -step Down Leg

0-80511-1

Race, NASCAR Approved

Winston Cup Style Racing

830

Mechanical

Annular

0-80496-1

Race

Gasoline

950

Mechanical

Double -step Down Leg

0-80498-1

Race

Alcohol

950

Mechanical

Double -step Down Leg

0-80577S

Race, Supercharger

Gasoline

950

Mechanical

Double -step Down Leg

0-80513-1

Race

Gasoline

1000

Mechanical

Double -step Down Leg

0-80514-1

Race

Gasoline

1000

Mechanical

Annular

SPECIAL NOTE: Part number 0-80507-1 is shipped from Holley without the high-speed air bleeds to allow for the Touring Series

Style racing calibration. See the air bleed section for clarification and identification of the high-speed air bleeds.

NOTE: These carburetors are not legal for use in California on any pollution-controlled motor vehicle.

INTRODUCTION:

Holley Performance Products has written this instruction sheet for the installation of the Model 4150 HP PRO-SERIES and HP ULTRA

carburetors. This instruction sheet contains all the information needed to install these carburetors. Please read all the WARNINGS and

NOTES, as they contain valuable information that can save you time and money. Holley Performance Products cannot and will not be

responsible for any alleged or actual engine or other damage, or other conditions resulting from misapplication of the carburetor described

herein. However, it is our intent to provide the best possible products for our customer; products that perform properly and satisfy your

expectations. 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. Central Time; please have the part number of the product you purchased when you call.

GENERAL INFORMATION:

 This instruction sheet cannot contain all of the information, which may be desired by some individuals. Further clarification is available in

HOLLEY CARBURETORS, published by H.P. books and available at your Holley distributor (P/N 36-73).

 An in-line fuel filter should be installed between the fuel pump and the carburetor.

 Recommended fuel pressure should be set at 7-1/2 psi maximum, 5 psi minimum. Fuel pressures above 7-1/2 psi can create severe fuel

control problems and are not recommended.

 Fuel lines should be a minimum of 3/8”.

 A Non-restrictive open-element air cleaner kit is recommended (Holley P/N 120-102).

 The pump cam adjustment kit is available under Holley P/N 20-12.

 Slosh tubes for preventing fuel starvation during rapid acceleration are available under Holley P/N 122-5000.

 Vacuum secondary diaphragm springs (if applicable), which vary secondary opening, are available under Holley P/N 20-13. For additional

parts and accessories, see the Holley Performance Parts Catalog.

Summary of content (8 pages)

PAGE 1
COMPETITION CARBURETORS MODEL 4150 HP PRO-SERIES MODEL 4150 HP ULTRA SERIES Installation and Adjustment Instructions CONGRATULATIONS on your purchase of 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 1-866-GOHOLLEY, Monday through Friday, 8 a.m. to 6 p.m. CST. Please have the part number of the product you purchased on hand when you call.
PAGE 2
REMOVAL OF OLD CARBURETOR: WARNING! Prior to and after installing your new carburetor, manually operate the throttle lever, checking for any sticking or binding. Failure to do so may result in a runaway engine or a wide open throttle condition, which could result in engine damage personal injury and/or death. NOTE: Make a visual inspection of the carburetor, looking for any missing parts, bent levers, or any possible shipping damage. 1. Remove the air cleaner. 2.
PAGE 3
WARNING! The carburetor should be installed directly onto its manifold without an adapter whenever possible. Sometimes an adapter can create problems with hood clearance, airflow, throttle linkage, fuel line attachment and/or fuel mixture distribution. 2. Place the carburetor in position over the four stud bolts and secure in place. To avoid warping the carburetor flange, tighten each bolt gradually. Tighten in a criss cross pattern to 60 in./lbs. Be careful not to overtighten the nuts.
PAGE 4
3. Start the vehicle. 4. Loosen the lock screw at the top of the assembly. 5. Turn the adjusting nut while holding the screw in place until the fuel level is at the bottom of the sight plug hole. A slight trickle should be seen at the threads. Turn the adjusting nut clockwise to lower the fuel level and counter-clockwise to raise the fuel level. Figure 3 6. Tighten the lock screw while holding the adjustment nut. 7. Replace the sight plug and lightly tighten with a screwdriver. 8.
PAGE 5
IDLE MIXTURE NEEDLES: Idle mixture needles control the air/fuel mixture at idle. The amount of air/fuel mixture used at idle is controlled by engine vacuum. So, when tuning the idle mixture, you are actually tuning for the best manifold vacuum. Idle mixture needles are found on the metering blocks. Your carburetor will have four idle mixture needles; one for each venturi. This is known as four-corner idle.
PAGE 6
Figure 7 1. Figure 8 Change pump shooters until the smallest diameter nozzle that provides the crispest response is found. Figure 9 2. Then change the pump cams and locations until the right cam is found that provides even more response. 3. Finally, change the pump shooter once again, until the crisp response is maximized. NOTE: 4.
PAGE 7
3. Remove and change the spring. The stiffer the spring, the later the secondaries will open. The lighter the spring, the earlier the secondaries will open. 4. Reassemble in reverse order. Avoid damaging the diaphragm between the secondary housing and the secondary spring cover. JETTING (MAIN JETS): Due to varied applications that a universal performance carburetor will work with, no additional tuning jets have been included.
PAGE 8
Experimenting with air bleeds is not recommended and should only be attempted by an expert carb tuner. Countless hours of testing have been performed on expensive flow stands to obtain the proper bleed size for a given calibration. It is unlikely that a better air bleed calibration can be obtained, however the 4150 HP Pro-Series are equipped with removable air bleeds. Here is some basic knowledge of how air bleeds work. The main or high-speed air bleeds affect the entire range of the main-metering system.