Ac delco spark plug number meaning. [6][7] We would like to show you a description here but the site won’t allow us. The heat rating of NGK spark plugs is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. I found these. 035 gap. The AC Delco Spark Plug Decoder Table Prefix and suffix letters are used to identify a specific type plus the numbers relate to thread size and heat range. The heat rating indicates the thermal characteristic of the spark plug, or how hot or how cold the spark plug is. Apr 16, 2019 · The correct plug for your engine is the 41-162 plug the Iridium version - OE plug. . Mar 21, 2010 · Home Search Cadillac & LaSalle Club Discussion Forum Cadillac & LaSalle Club Forums Technical / Authenticity (Moderators: The Tassie Devil (le), Lars Kneller 8246, Carfreak, quadfins, Barry M Wheeler #2189, Highwayman68) Can someone school me on spark plugs, Please??? Oct 6, 2018 · ACDelco GM Original Equipment Iridium Spark Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. 240) How to read an AC Delco spark plug nomenclature. They are our latest in spark plug technology and an exact replacement for your vehicle's original components. May 20, 2025 · The ACDelco heat range chart is a chart that provides the heat rating in addition to other characteristics of the ACDelco spark plugs. 045 gap vs R42T and R45T that do not carry this note, and I believe usually have a . Feb 2, 2010 · Some are using a lower number for a hotter plug where as some others are using a higher number for a hotter plug. AC-Delco In 1974, in an effort to streamline its operations and marketing, General Motors merged AC Spark Plug's aftersales operation with United Delco to create the new AC-Delco (Albert Champion Dayton Engineering Laboratories Company. The numeric code does not in any way correspond to the heat range of the spark plug. Some of these may no longer be readily available or have been superseded by GM and can be used to cross-reference to another brand such as Autolite, Bosch, NGK, Champion, etc. The R44LTSM is just the conventional plug- they dont recommend using that one- because it would have to be changed every 30,000 miles. Spark Plugs By Year How to read an AC Delco spark plug nomenclature. When selecting the right spark plug for an engine, manufacturers must consider many factors that affect plug performance, such as heat range, conventional or precious metal, extended length insulators, tapered electrodes and gap size. The following matrix of spark plugs used are for AC Delco as installed. The AC Delco Spark Plug Decoder Table - … The AC Delco Spark Plug Decoder TablePrefix and suffix letters are used to identify a specific type plus the numbers relate to threadsize and heat range. All of these features are addressed by the wide range of available ACDelco spark plugs. These numbers help you understand the plug’s size, heat range, and construction type. Sep 11, 2013 · The AC Delco R43T and R44T spark plugs are listed as "Heavy Duty" and say to use a . Mar 29, 2013 · AC Delco spark plugs, "R" means resistor type, "46" means: "4" is the 14mm threads and "6" is the heat range and "S" means projected tip. For example, the R45TS Spark plug shown is: R - Resistor 4 - 14 mm Thread 5 - Heat Range (range 1-5 start with a 3) T - Taper Seat (No T for a gasketed plug) XL - Extra Long Reach, 3/4" fully SPARK PLUG warranty ACDelco Automotive Parts are warranted throughout Australia against faulty workmanship and materials for a period of 1 year or 20,000km (whichever comes first) from the purchase date. Aug 1, 2016 · I ran across this while researching spark plugs. Feb 2, 2010 · The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. What is the reason for this? Thanks Spark Plugs & Spark Plug Wires (Group 2. The 41-962 can also be used- but that is the double platinum version as an optional plug. ) AC-Delco then marketed various AC and Delco-branded products. Besides, the heat range of the spark plug would not make any difference in exhaust sounds unless the previous spark plugs were fouled. Sep 3, 2025 · This guide will help you navigate the ACDelco Spark Plug Chart, explaining the different types, heat ranges, part numbers, and how to choose the right spark plug for your vehicle. It was very helpful to me to make sense of the numbering system for the AC spark plugs and I thought it might be helpful to others. I am going to to stick with AC Delco and I would like to understand how their heat range numbering system works. The heat range of a spark plug is the range in which the plug works well thermally. These Iridium Spark Plugs are a high quality replacement for many vehicles on the road today. The higher the number, the hotter the plug on AC delco's. For example, the R45TS spark plug shown is: · R - Resistor · 4 - 14 mm Thread · 5 - Heat Range (range 1-5 start with a 3) · T - … Jun 17, 2025 · Spark plug numbers carry specific information about the plug’s characteristics. A "6" is the hottest AC Delco spark plug available. Therefore, selection of a spark plug with a different code number is not recommended. gysek sr 8w1i ub3 gimtu kgh nrt3 vazlg g6a29o8 qczewh