See cross reference chart for AC Delco MR43T and more than 80.000 other spark plugs. I did this when then motor was out of the boat. The kind of firepower you expect from ACDelco. Heat is conducted away from the firing tip through the (1) insulator to (2) the spark plug shell to (3) the cylinder head. The 43's should be perfect..035"-.040" gap will also be perfect. Copper, of course, is a fantastic conductor of heat, which in this case helps to transfer the heat through your spark plug effectively. This catalogue lists only vehicles officially imported or manufactured in the UK and is effective from 3rd November 2020. VIP and Elite members - Refer your friends to Speed Perks and get 1000 points after their first purchase. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. If that depth is very shallow, that constitutes a cold heat range spark plug. I know this has been covered a thousand times, my apologies in advance. $19.99. I'm running the NGK TR5's and they are the same heat range as the AC 41-932. 5614210 MR43LTS, set of 8 25164641 #3, Rapid Fire style, set of 8 P526S Accel U-Groove “SHORTY” Double Platinum Header Plugs approximately 3/16" shorter then R44LTS plugs, set of 8 RS12YC Champion Autolite 104 or 26 ACCEL 516 Bosch HR10B or HR10BX, HR9DC Any particular brand or heat range plug work better then the other? Free shipping. same heat range. Spark Plug; ACDelco Professional Conventional Spark … Thus, heat ranges are primarily controlled by the length of the insulator through which the heat must travel before escaping to the cylinder head. The original plugs in my engine were AC-41-932. I don't EVER intend to change them … 3- heat range LT - Long reach, .715" (18.16 mm), Tapered Seat T - Tapered Seat Shell Design TS - Tapered seat with extended tip LTS is a long reach tapered seat plug with a extended tip. Central Electrode - From the terminal cap, the electrical charge passes through the metal conductor core to deliver the spark that ignites the gases in the engine's combustion chamber. I replaced the MR43LTS that were in my Crusader 5.7 TBI with NGK iridium plugs (marine version) in the same heat range/reach - can't recall the number and I had to order them. The spark plug is what started it all for ACDelco. Get deals on automotive parts, truck parts and more. Pulstar: Pulstar indicates the heat range by the number "1" or "2" in the plug number. Please check specific vehicle application and owner’s manual. The length of the insulator and the metal conductor core help determine a plug's heat range. Free shipping . Shop for ACDelco RapidFire Platinum Spark Plug 14 with confidence at AutoZone.com. Get yours online today and pick up in store. Buy Spark Plug - Copper - AC MR43LTS online from NAPA Auto Parts Stores. Part# NGK STK # NGK # Comp. I am getting knock retard also, so am hoping a colder plug will help. Has anyone used these plugs any insight would be great. Use Cross References as a guide only. Customer Questions & Answers. TS it a tapered seat plug with a extended tip. 1.This application listing is to be used as a guide only. Parts are just part of what we do. Free shipping . For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. ngksparkplugs.com Tech Support: (877) 473-6767 ext. Most talk is about the AC Delco MR43T and MR43LTS Marine Spark Plugs. Looked up the cross reference and it goes to a r42lts the only thing I can see diff in this plug is slightly higher heat range. Typically 'coldest' is 41 and 'warmest' 45 or 46. $19.99. ACDelco Marine Spark Plugs MR43LTS 19355201 Set Of 8. My boat has never run so smooth or started better than it does now with the NGK's. This should be sufficient to find a good plug for your engine. Visit our site for coupons and promotions. How is Heat Range Engineered? Contact seller for limited warranty part … They're high quality, reliable and their advanced materials and design provide superior anti-fouling characteristics, which reduce carbon build up over a wide heat range. I have a stock L31 Vortec long block with a TBI mounted on it. I would look to the basic's of tuning first, but make sure you have the correct plug in there. With ACDelco, the heat range #'s go up as the plug get's a 'hotter' designation and vice versa. My question is that I'm going through the engine and doing tune up, the tag calls for mr43lts plugs and none of the auto parts stores have them. I am currently running AC Delco R44LTS plugs, and reading the plugs, I would like to step down a heat range or 2? ACDelco Marine Spark Plugs MR43LTS 19355201 Set Of 6. Due to differences in design and material, plugs in cross reference section are not exactly alike. Heat Range: Consider the speed under the most favorable conditions spark plugs available will exchange the heat from the tip of the vessel top. Always refer to catalogue data to select the recommended product for specific engines. Now, with over 100 years of innovation behind each spark plug, you know you’re covered. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs). Almost gone. Causes of pre-ignition include but are not limited to a buildup of deposits that can become incandescent in the combustion chamber, improper installation torque being applied to spark plugs, and having spark plugs with a heat range that is too hot for the engine’s operating condition. Get yours online today and pick up in store. Spark Plugs. Product Cross Reference. Part# NGK STK # NGK # 44 3510 B6S 41-963 7740 PTR5C-13 45FFS 6222 BPR5HS 45 3210 B4 41-965 2467 PTR5A-13 45L 3112 B4L 46 3210 B4 41-974 7862 PZTR5A-15 45NS 7832 BP5ES ACDelco 41-962 Professional Platinum Spark Plug (8 Pack) 6 PCSNEW -- DENSO #4511 PLATINUM T T Spark Plugs -- PT16TT. The 44 is a 'warmer' plug than the 43's. The spark plug is what started it all for us, and with over 100 years of innovation behind each spark plug, you know they're going to be great. With that being said, unless you were WAY off, it shouldn't have a huge effect. Read full disclaimer. $21.65. ACDelco Specialty Marine Spark Plugs are everyday replacement plugs designed for reliability and efficient performance in jet boats, inboards, outboards, and personal watercraft. Replaces - AC MR43LTS. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. Free shipping . Budget: With a specific goal to locate the best quality spark plugs, you need a value go as a primary concern. From the old to the new and even the nonautomotive, ACDelco has spark plugs to fit just about every need. Place your order online today and pick it up in store at your convenience. The heat rating is a measure of the amount of heat dissipation.The heat range of a spark plug is the range in which the plug works well thermally. ACDelco Marine Spark Plugs MR43LTS 19355201 Set Of 6. ACDelco MR43LTS Specialty Marine Spark Plug (Pack of 1) Quicksilver 816336Q NGK BPR6EFS Standard Spark Plug, 1-Pack. ACDelco Marine Spark Plugs MR43LTS 19355201 Set Of 4. It's kind of hard to tell with Accel plugs where they fall into the heat range. Add to … Shop for ACDelco Copper Spark Plug R43TS with confidence at AutoZone.com. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. A “hot” spark plug lengthens the depth of the ceramic which lengthens the distance from the center electrode end of the plug to where it contacts the spark plug shell. This item ACDelco MR43LTS Specialty Marine Spark Plug (Pack of 1) Quicksilver 898264001 AC Delco MR43T Spark Plug Quicksilver 816336Q NGK BPR6EFS Standard Spark Plug, 1-Pack Parts are just part of what we do. $14.99. This boosts performance compared with a tacky spark plug and again increases durability. These are displayed as a 2 or 3 digit number after the hyphen. Get product details, choose a store, and get directions. MR43LTS TR5 2238 MR43T BR6FS 4323 MR44T YR5 7052 Note: This cross chart is for reference only. The heat range is established by the distance the heat in the center electrode and insulator ceramic must travel before it contacts the steel body of the spark plug. The item price is per spark plug NGK Spark Plugs provide the ultimate performance for your engine. Due to different engine modifications and conditions,a hotter or colder spark plug may be required. Your friends get $30 off their order immediately. After research I found that they were replaced by the AC-41-993. 48 replacement spark plugs for AC Delco MR43T. Other factors effecting Heat Range are the I would use the colder of the two, if it's a performance application at all. 94 Chevy C1500. Manufacturer Heat Range: 3: Pre-Gap Size: 0.044 in: Reach: 0.433 in: Resistor Type: Yes: Seat Type: Conical: Thread Diameter: 0.551 in: Customer Review. then again replaced by AC-41-101 (Iridium) My engine is a 5.0 gl-e 4012160010 I guess my question is which plug is correct and why. shawn Shop for ACDelco Spark Plug Part #: R42LTS for your vehicle. (That's the AC MR43LTS, or NGK comparable) ... Heat range is heat range when it comes to spark plugs. Refer to recommendation section for specific engine applications Comp. 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