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Holley Manuals & User Guides

User manuals, setup guides, troubleshooting help, and repair information for Holley products.

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User Manuals, Instructions and Guides for Holley products.

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Holley Terminator X Max MPFI Controller Kit User Guide

August 5, 2025

Holley Terminator X Max MPFI Controller Kit User Guide TERMINATOR X AND X MAX PARTS GUIDE PART NUMBER ECU MAIN ENGINE HARNESS IGNITION HARNESS INJECTOR HARNESS TRANSMISSION HARNESS DRIVE-BY-WIRE HARNESS…

Holley 302-34 Off Road Baffle For LT Oil Pans Installation Guide

March 10, 2024

OFF-ROAD BAFFLE for LT OIL PANS (302-24 or 302-24BK) P/N 302-34 Instruction Sheet 199R12452 302-34 Off Road Baffle For LT Oil Pans NOTE: This instruction sheet is intended for installation…

HOLLEY 223-36A Intech Cold Air Intakes Instruction Manual

October 25, 2023

HOLLEY 223-36A Intech Cold Air Intakes Product Information Product Name: 2019-2022 Ram 1500 V8, 5.7L Intech Cold Air Intake System Part Number: 223-36 Installation Instructions: P/N 80R158 223-36A 223-36H 61R867…

Holley 2019-2022 Ram Gauge Mounting Arm Instruction Manual

October 19, 2023

Holley 2019-2022 Ram Gauge Mounting Arm Instruction Manual Materials Required Tools 10 mm 1/4” drive Socket, deep or regular 3 1/4” Drive Extension 1/4” Drive Socket Wrench Small 1/7” Flat-blade…

Holley 550-540 Shiny Sniper EFI Throttle Body System User Guide

October 18, 2023

4 Injector Sniper EFI XFlow (550-540 Shiny, 550-541 Black, & 550-542 Gold) 8 Injector Sniper EFI XFlow (550-544 Shiny, 550-545 Black, & 550-546 Gold) QUICKSTART MANUAL SNIPER EFI INSTALLATION INSTRUCTIONS…

Holley 197-305 Mopar Gen III Hemi Premium Alternator Instructions

October 2, 2023

Holley 197-305 Mopar Gen III Hemi Premium Alternator Important DANGER! Eye protection must be worn when working on batteries. WARNING! Remove any jewelry before working on ANY electrical system. WARNING!…

Holley 20-160 Low Mount Complete Accessory Drive Kit Instruction Manual

October 2, 2023

Holley 20-160 Low Mount Complete Accessory Drive Kit Product Information The Holley Accessory Drive Kit consists of various components that are necessary for the installation and operation of the accessory…

Holley 300-685BK Hi-Ram Modular Intake Manifold Kits Instruction Manual

October 1, 2023

Holley 300-685BK Hi-Ram Modular Intake Manifold Kits Product Information The Holley Gen 3 Hemi Hi-Ram Modular Intake Manifold Kits are high-performance intake manifold kits designed for various Hemi engine applications.…

Holley 199R12422 3.5 GPM Fuel Pump Instruction Manual

October 1, 2023

Holley 199R12422 3.5 GPM Fuel Pump WARNING! THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING INSTALLATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN POOR PERFORMANCE, VEHICLE DAMAGE,…

Holley 12-350 Dual Fuel Pump Module System Instruction Manual

October 1, 2023

Holley 12-350 Dual Fuel Pump Module System Product Information The Gen 5 Camaro Twin Pump Fuel Module is a drop-in fuel cell pump hanger designed for use in the Gen…

Holley Sniper EFI Quickstart Manual: Installation & Setup Guide

Quickstart Manual

A comprehensive quickstart manual and installation guide for the Holley Sniper EFI Throttle Body System (models 550-510, 550-511, 550-516). This document provides essential information for installation, system requirements, wiring, calibration,…

Holley Accessory Drive Kit Installation Guide 20-163 & 20-163BK

Installation Guide

Installation guide for the Holley Accessory Drive Kit (Part Numbers 20-163 & 20-163BK) for LS engines. Includes parts list, dimensions, and step-by-step instructions for A/C, alternator, power steering, and belt…

Holley PWM Alternator Harness Installation and Configuration Guide

Installation Guide

This guide explains how to install and configure the Holley PWM Alternator Harness (Part Numbers 558-475 & 558-476) for controlling GM and Ford alternators with Pulse Width Modulation signals using…

Holley Coyote Smart Coil P/N 556-160 & 556-161: Specifications and Wiring Guide

Technical Specification

Detailed specifications, wiring instructions, and performance graphs for the Holley Coyote Smart Coil (P/N 556-160 & 556-161), designed for Holley EFI systems and high-powered applications.

Holley HP EFI Universal Retrofit Kits Installation Instructions

Installation Guide

This document provides detailed installation instructions for Holley HP EFI Universal Retrofit Kits (models 550-500 and 550-501). It covers essential steps from initial overview and required skills to fuel system…

Holley EFI Wiring Manual & Diagrams 199R10555

Wiring Manual

Comprehensive wiring manual and diagrams for Holley HP EFI and Dominator EFI Systems (Model 199R10555), covering ECU installation, pinouts, sensors, ignition systems, and programmable I/O.

Holley EFI Distributor Installation and Configuration Guide

Installation Guide

Detailed instructions for installing, configuring, removing, and aligning Holley EFI distributors. Covers sensor settings, rotor alignment, and troubleshooting for optimal engine performance with Holley EFI systems.

Holley Fuel Pump Relay Kit P/N 12-753 Installation Instructions

Installation Guide

Detailed installation instructions for the Holley Fuel Pump Relay Kit (P/N 12-753), including safety warnings and a description of the wiring diagram.

Holley Sniper 1 & 2 / Terminator X/Max EFI Wiring Diagram

Wiring Diagram

Detailed wiring diagram and installation guide for Holley Sniper 1 & 2 and Terminator X/Max EFI systems, covering connections for Vintage Air GEN IV ECU, cooling fans, and A/C compressor…

Holley SNIPER Gen 5 Camaro Twin Pump Fuel Module Installation Guide (12-350)

Installation Guide

Comprehensive installation instructions for the Holley SNIPER Gen 5 Camaro Twin Pump Fuel Module (P/N 12-350). Covers parts included, required items, step-by-step installation, plumbing, and wiring for performance vehicles.

Holley SNIPER Gen 5 Camaro Twin Pump Fuel Module Installation Guide (P/N 12-350)

Installation Guide

Comprehensive installation guide for the Holley SNIPER Gen 5 Camaro Twin Pump Fuel Module (P/N 12-350). Covers parts included, required items, module I/O, installation steps, plumbing, wiring, and safety precautions.

Holley Gen 5 Camaro Twin Pump Fuel Module Installation Guide

Installation Guide

Installation guide for the Holley Gen 5 Camaro Twin Pump Fuel Module (P/Ns 12-351). Covers parts included, required items, and step-by-step instructions for removal, installation, plumbing, and wiring.