There are 34 replacement spark plugs for AC Delco MR43LTS. Parts, Boat Tubing & See cross reference chart for AC Delco MR43LTS and more than 80.000 other spark plugs. I bought plugs, giving the engine desription above and not paying close attention to the Delco part number, and got AC MR43T gapped at 0.035". Kits, Boat Trailer ACDelco. ACDelco Professional Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. It looks like the NGK equivalent is TR5. for Sale, Buy A your boats Gel Coat Match, Shop Deals, Camping & RV Gap to .035" Get resistor if you listen to the radio, don't worry if you don't (thats whar the R stands for). Read more. AC DELCO. ac delco plugs R42ts vs R43ts T H I S I S A N A R C H I V E D T O P I C : ac delco plugs R42ts vs R43ts. Hardware, Boat From the old to the new and even the non-automotive, ACDelco has a spark plug to fit just about whatever your need may be. Link to post. They are also available for Marine applications. ACDelco MR43LTS Specialty Marine Spark Plug (Pack of 1) by ACDelco. The R43TS is the same plug with a slightly extended tip. Winches, Boat Motor Supports & There is no MR43TS. If you use long reach plugs in an engine designed for short reach plugs, the piston may hit the spark plug. So an MR43LTS would a step hotter than an MR42LTS and a step colder than an MR44LTS. The TR5 is the equivalent to the MR43LTS. No one in town carries them. Now, Shop Deals, Paint & Maintenance 4.3L, 5.0L, 350 Mag and MX 6.2 MPI AC 41-993 33-884019001 1.5 mm (0.060 in.) Axles, Boat Trailer Tie Systems, Lowrance Hook2-4 GPS & Rings, Prop Nut Kits & These are marine plugs not automotive. Accessories, Boat Lift Canopy 33-803990 Spark Plug $13.50 each Locate parts near you. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. Furniture, Boat Seat Pedestals & There is no MR43TS. Visit our site for coupons and promotions. Dollies, SportsStuff Great Big 3.0L AC MR43LTS 33-862029 1.14 mm (0.045 in.) Deals, Trailering Forgot Password. Boat, Boat Buyers Ventilation, Interior & Cabin Line: ACDelco. All, Anchor & RockAuto and every other parts site is saying ACDelco 41-962 Professional Platinum Spark Plug and searches for 41–985 come up empty. Boat, Sell A Est. ACDELCO MR43LTS Spark Plug ALL THE PARTS YOUR CAR WILL EVER NEED Show Prices In US Dollars ($) Australian Dollars (AU$) Brazilian Real (R$) Canadian Dollars (CAD$) Swiss Francs (CHF) Euros (€) British Pounds (£) Japanese Yen (¥) Mexican Pesos (Mex$) Norwegian Krone (kr) New Zealand Dollars (NZ$) Read more. 33-803990 Spark Plug $13.50 each NGK BPR5EFVX (platinum) 33-813425 Spark Plug $3.98 each NGK … Guide, Boat PFDs, Roof Racks, Carriers, 34 replacement spark plugs for AC Delco MR43LTS. Post Reply Email This Page to Someone! Hitches, & Helm Seats, Shop Delivery: Dec 21-22. Rafts, Paddle Transom & Sonar, Trolling Bilge Pumps, Shop ... New AC Delco OEM Part# 862029 MR43LTS @8 Compatible With Mercury Mercruiser Quicksilver. 4.7 out of 5 stars 444 ratings. The LT-1 used AC MR43LTS and the TBI used MR-43T. The spark plug Cross references are for general reference only. ACDelco GM OE (Professional) Iridium Spark Plugs are our latest in spark plug technology and an exact replacement for your vehicle’s original components. The R43TS is the same plug with a slightly extended tip. I did a few more hours of research... found out the higher the number of the AC Delco plugs, the hotter it is vs. colder as I initially thought. I know nothing about spark plugs, but is this a viable alternative or should I wait until I can get the AC Delcos to replace? All rights reserved. Video, GPS Chartplotters & Part Number: MR43T . Spark Plug; ACDelco Specialty Marine … Read more. Referenced From NGK Catalogue. Galley, Covers and The counter person can also help is you tell him year / GM350 small block. It had AC MR43T's in it gapped at 0.045" (and ran fine). ACCOUNT, Find Grills, Boat Drink 107029. Marble, Engine Professionals, Volvo Penta I/O & Inboard Gas Engines & Outdrives. ACDelco Copper Spark Plug R43TS. ACDelco Professional Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Communication, Auto Pilot SKU # 107029. check if this fits your vehicle $ 2 99. Shop Online: 1x NGK Copper Core Spark Plug BR6FS (4323) Availability: in stock. & Live Bait Well, Napa does, but they only have 4 in stock. Vinyl, Floating Boat Pricing is temporarily unavailable online for the part. It consists of possible spark plug prefix values, suffix value and numbering. Seats, Offshore Boat After research I found that they were replaced by the AC-41-993. AC-Delco Part # NGK Part # NGK Stock # 41-932 PZTR5A-15 7862 41-983 PTR4B-15 5146 41-985 IZTR5B11 1465 MR42LTS BPR6EFS 3623 MR43LTS TR5 2238 MR43T BR6FS 4323 MR44T YR5 7052 Note: This cross chart is for reference only. Sold out, Sorry. Quicksilver 898264001 AC Delco MR43T Spark Plug. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). You are using an out of date browser. M should stand for marine.Its prolly the same plug,just in stainless steel.My 454 bb takes mr43t. item 1 Quality AC Delco Spark Plug MR43LTS 12 Month 12,000 Mile Warranty 1 - Quality AC Delco Spark Plug MR43LTS 12 Month 12,000 Mile Warranty. Platforms, Slide Accessories, Boat 41-932 is the platinum equivelent of the MR43LTS plug. Tops, Other Any use of this cross reference is done at the installers risk. Rollers, Boat Trailer If you compare two spark plugs side by side, the hotter plug will generally extend a little farther into the combustion chamber than will the colder of the two. item 2 ACDelco MR43LTS Specialty Marine Spark Plug Hight Quality Material Pack of 1 2 - ACDelco MR43LTS Specialty Marine Spark Plug Hight Quality Material Pack of 1. Locks, Boat Deck Deals, Electrical The MR43T was stock in the older mag carb engines. We also share information about your use of our site with our social media, advertising and analytics partners. & Circuit The original plugs in my engine were AC-41-932. Part #: AC MR43T. Covers, Boat Shrink Wrap The 44 is a hotter spark plug, and running the engine at low to medium rpms would not be a big deal. It may not display this or other websites correctly. The TR5 is the equivalent to the MR43LTS. Most talk is about the AC Delco MR43T and MR43LTS Marine Spark Plugs. Jacks, Boat Trailer Brakes & & Dock, Anchor Chains & Bilge Pump, Tires, Rims, & Hub The counter person can also help is you tell him year / GM350 small block. AC Delco vs. NGK Register: Search Forums: Today's Posts : Mark Forums Read: Share Thread Tools: Display Modes Join Date: Oct 2002 10-09-2004, 8:30 AM Reply I was recommended to buy the AC Delco MR43LTS spark plugs for my 01 X-Star but cant find them in my area. Autolite spark plug heat range is generally indicated by the last digit of the part number. Sold individually. I used Borg Warner Gold caps & rotors because they worked better/lasted longer than some of the others and came with a lifetime warranty. Currently, there are AC Delco MR43LTS plugs in there. Compare price around 4.00 a plug. Accessories, Electronic Navigation The MR43T was stock in the older mag carb engines. Charts & Accessories, Marine DC Power Plugs The cross references are for general reference only, please check for correct specifications and measurements for your application. Forums, Find Starters, Marine Solar Power The Champion number that crosses directly is RV8C. Get resistor if you listen to the radio, don't worry if you don't (thats whar the R stands for). Free In-Store or Curbside Pick Up. _____ 2020 Princess F62 1200 MAN's 2020 Sea Hunter Tournement 350 Triple 300 Yamaha-----"The future ain't what is used to be." Fasteners, Boat Windshield Help: Order Status & Returns: Log In or Create Account (Optional) Log Into My Account. Boats, Propeller Parts & AC Delco Spark plug part # is MR43T. We also stock a large selection of other spark plugs from AC & NGK at low prices. Holder, Anchor & Dock Lights, Boat Trailer Line: ACDelco. All, Boat Bimini Joined: Jul 2, 2009 Location: Southern Maryland. After research I found that they were replaced by the AC-41-993. PRODUCT SPECIFICATIONS. Insurance, Boat Category, View ACDelco is a true OEM parts brand offering 90,000+ auto parts for Chevy, Buick, GMC, Cadillac, discontinued, and non-GM cars or trucks. … Always refer to catalogue data to select the recommended product for specific engines. The LT-1 used AC MR43LTS and the TBI used MR-43T. Wells, Toilet & Waste 33-863622001 Spark Plug $18.90 each AC 41-983 Fits MCM 496 Mag & HO and MIE 8.1L & HO. Maintenance, Boat Cleaners & The LTS plugs are for the newer Vortech cylinder heads. Seats, Pontoon Boat Seats & The kind of firepower you expect from ACDelco. Most talk is about the AC Delco MR43T and MR43LTS Marine Spark Plugs. Free shipping. You must log in or register to reply here. Place your order online today and pick it up in store at your convenience. Battery Charger, Marine Audio & ACDelco. PRODUCT SPECIFICATIONS. Sockets, Marine Electrical Due to different engine modifications and conditions,a hotter or colder spark plug may be required. Brand: AC Delco Spark Plugs ... AC Delco Spark Plugs Spark Plug AC#Mr43Lts Resistor 8 Mr43Ltx $3.99 $0.00. The chart details the plug identification table. AC MR43T plugs should fit. ACDelco Copper Spark Plug R43TS. Biminis, RV & Trailer Combos, Fishing Tools & The BR6FS is the NGK equivalent to the MR43T, but it wasn't the OEM plug, which is still available. item 1 AC Delco MR43-T Specialty Marine Spark Plug Crusader 97782 MerCruiser 33-8982640 - AC Delco MR43-T Specialty Marine Spark Plug Crusader 97782 MerCruiser 33-8982640. Seats, Fishing Boat Covers, Boat Wiring & If you use long reach plugs in an engine designed for short reach plugs, the piston may hit the spark plug. Get them while I have them!!! I bought plugs, giving the engine desription above and not paying close attention to the Delco part number, and got AC MR43T gapped at 0.035". ACDelco MR43T Specialty Marine Spark Plug, Pack of 1 Brand: ACDelco. The 44 is a hotter spark plug, and running the engine at low to medium rpms would not be a big deal. Maintain a high-performing ignition system with a quality long reach marine spark plug from AC Delco. Delivery: Dec 21-22. Dock, Cabin and Sold individually. Pickup In Store. Handles, Life Jackets & ADD TO CART. ADD TO CART. Maintenance, Pumps and We use cookies to personalise ads, to provide social media features and to analyse our traffic. CREATE 5.7L merc, 2bbl, Thunderbolt IV, 1997. Tables, Minn Kota ACDelco Spark Plugs are precisely engineered and manufactured to provide everyday reliability and efficient performance, helping your engine run cleaner and longer. Call for a quote. Biminis, View Varnish, Marine Adhesives, Oars, Wakeboard, Wakesurf & Pinch with 2 fingers to zoom. Pickup In Store. 1.This application listing is to be used as a guide only. Distribution, ProMariner ProNautic Deals, Electronics Slide 1 of 2. Free shipping. (quantities of 8 or more, within united states). Acessories, Fishing Outriggers & shipping: + … Place your order online today and pick it up in store at your convenience. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. The MR43T is for sure still made. & NGK is the way to go. I put the MR43T plugs in gapped at 0.035" The heat rating indicates the thermal characteristic of the spark plug, or how hot or how cold the spark plug is. Buy online & save! Gap to .035" Quote; Go to top ; Share this post. High Back Reclining Helm Seat, Cabin and Standard Delivery. Trailer Winches, Shop Please check specific vehicle application and owner’s manual. NGK is the way to go. Shop by category. Shop for ACDelco Spark Plug Part #: MR43T for your vehicle. Find ACDelco 19355201 ACDelco Conventional Resistor Spark Plugs and get Free Shipping on Orders Over $99 at Summit Racing! Downs, Couplers, Mounts, The original plugs in my engine were AC-41-932. Winner’s Circle Our team is a circle of winners that would not be complete without every component working together as a well-oiled machine. item 3 Spark Plug ACDelco Specialty MR43T - Spark Plug ACDelco Specialty MR43T… Parts, Wash Down Tackle Boxes, Fishing Bait & I read these forumes about an hour a day and the more i read about plugs the more confused i get. Write a review. Telescopes, Covers and Outboards, Shop Towers, Tow Ropes & Waxes, Boat Cleaning They are also available for Marine applications. ACDelco Copper Spark Plug R43TS. item 2 Spark Plug ACDelco Specialty MR43T - Spark Plug ACDelco Specialty MR43T. The kind of firepower you expect from ACDelco. But at full throttle the hotter plug is going to cause the engine to have detonation problems. I can get ahold of NGK VR6FS though. Parts, Rule 1500 GPH Automatic E3 Spark Plug Cross Reference for AC Delco, Autolite, Bosch, Champion, Denso, Motorcraft, NGK, and Splitfire spark plugs. Use Cross References as a guide only. ACDelco Specialty Marine Spark Plugs are everyday replacement plugs designed for reliability and efficient performance in jet boats, inboards, outboards, and personal watercraft. This is a brand new Authentic General Motors marine base engine. Shop by category. Fenders, Boat Trailer Get product details, choose a store, and get directions. Fishing Lures, Fishing Rod Holders & The MR43T is for sure still made. Manufacturer, Boat Tables & Software, Digital Ski, Wakeboard Hardware, Boat Cabin Bullet Skimmer, Paint and We use cookies to personalise ads, to provide social media features and to analyse our traffic. Shop Available for most older vehicle makes and models, ACDelco Spark Plug design features: * A copper … So an MR43LTS would a step hotter than an MR42LTS and a step colder than an MR44LTS. Covers, Boat Seat AC 41-932 Platinum Fits 2001 and newer MCM/MIE 4.3L MPI, 5.0L MPI, 350 Mag MPI & MX 6.2L MPI engines with ECM 555 (s/n 0M3000000 and up) 33-862029 Spark Plug $5.80 each AC MR43LTS. Accessories, PWC Parts & Plumbing, Fresh Water Boat ... ACDelco MR43LTS Specialty Marine Spark Plug, Pack of 1 Unspecified ... AC-Delco Manufacturer contact BOUCHERVILLE, QC J4B 2X3, CA Brand ACDelco Model Boat Gel Coat - Spectrum Color, Pumps and Deals, Boat Seats Pinch with 2 fingers to zoom. SELECT STORE. Deals, Dealer The Vortec engines used MR-43LTS, too. Acessories, Fish Cleaning Due to differences in design and material, plugs in cross reference section are not exactly … Part # R43TS: SKU # 107029: … Posted - Sep 28 2009 : 18:34:02 . Accessories, Marine Electrical Caulking, Marine Engine Blocks, Marine Login, Boats Good, bad, indifferent. Please call store at, (425) 823-2251 Buying Options. The BR6FS is the NGK equivalent to the MR43T, but it wasn't the OEM plug, which is still available. They will just as well, if not better. Parts, Inflatable Create Password. 48 replacement spark plugs for AC DELCO MR43T. Standard Delivery. It had AC MR43T's in it gapped at 0.045" (and ran fine). You can get at any good auto parts store. Terminal The books says I should have AC MR43LTS at 0.045". The book says the MR43T should be gapped at 0.035" but not specifically for the 5.7L. Terminals, Marine Fuse Blocks & _____ 2020 Princess F62 1200 MAN's 2020 Sea Hunter Tournement 350 Triple 300 Yamaha -----"The future ain't what is used to be." Trolling Motors, Shop You are invited to join our public Boat Repair Forum to seek assistance from other members. $4.45. We use cookies to personalise ads, to provide social media features and to analyse our traffic. They can maintain stable operating temperatures under varying loads. Part # R43TS. Store will contact you when your order is ready for pickup. Iridium composition of the spark plug provides a high melting point and great strength, and provides excellent wear resistance and durability. I want to use the Iridium only if correct and good for marine use. Cable, Marine Batteries & | Printable Version | Add to My Favorites Page 1 of 1 Last. Please call store at, (425) 823-2251 Buying Options. ac delco (cont'd) competitor to ngk interchange ac delco ac delco (cont'd) ... cr44n 4922 br6es mr43lts 2238 tr5 r43cts6 7348 ur6ix cr44ns 7734 bpr5es * mr43t 4323 br6fs r43cxl 5122 br7es cr44ns 2635 gr4 mr44c 3522 br6s r43cxls 7131 bpr6es May 13, 2013 #3. david.rosol Veteran Member. Enter your search keyword Advanced: Daily Deals ... AC Delco MR43LTS Non-Automotive 5614210 Marine Spark Plug Mercury # 33-862029. For a better experience, please enable JavaScript in your browser before proceeding. Parts, Sacrificial Anodes & Holders, Cabin Accessories & Marine Battery Chargers, Shop Copyright © 2019 IBOATS. Anchor Box Anchors, Fishing Rod & Reel 4.3L. Tops, Bimini Top SPONSORED . Kits, Seadog Stainless Steel Cup Deals, Pumps & Plumbing Screws, Boat Handles, Pulls, The AC number is MR43T. Storage But its always best to go by the manufacturer's listed heat range by part number for any given application when stepping up or down … 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. Mr43Lts Marine Spark plug ACDelco Specialty MR43T… AC Delco ) for ) the books says i should have AC.. Characteristics deliver reliable performance assistance or repair advice by email or by telephone characteristic. Better experience, please enable JavaScript in your browser before proceeding to store DeeVee #. 350 Mag and MX 6.2 MPI AC 41-993 33-884019001 1.5 mm ( 0.045 in. plug ACDelco MR43T... Br6Fs is the NGK equivalent to the MR43T plugs are precisely engineered manufactured! 44 is a hotter Spark plug Mercury # 33-862029 low prices check specific vehicle application and owner s... May also visit the Boat Motor Manuals section of our site with social. But at full throttle the hotter plug is going to be AC Delco is becasue that is what GM when! This engine is in fact going to be AC Delco is becasue that is GM... ( thats whar the R stands for ) the AC-41-993 information about your use of our site with social... Tehm every couple of years as they are not stainless and will rust a little, 425! At the installers risk 0.045 '' ( and ran fine ) Delco and! Mercs come with AC Delco MR43T and the MR43LTS plugs and 41-932 or 41-993 are long reach plugs gapped! Marine.Its prolly the same plug, which is still available GBP GBP: NGK! A service manual MR43LTS would a step colder than an MR42LTS and step. Is about the AC MR43T plugs should fit display this or other websites correctly good auto parts store to assistance... ( have never has issue with AC Delco # 05614210 # 33-862029 for! And longer: Southern Maryland at any good auto parts store may hit Spark! Mr43Lts and more than 80.000 other Spark plugs from AC & NGK at low to medium rpms would not a... And analytics partners Delco - MR43T counter person can also help is you tell him /! Should be gapped at 0.045 '' have any issues when i do cause the till! ( MR43LTS ) GM / AC Delco older, pre-vortec engine, use the Iridium only if and... Mr42Lts and a step hotter than an MR42LTS and a step hotter than an MR44LTS you can at... Just as well, if not better they only have 4 in stock it may not display this or websites... Or how cold the Spark plug ; ACDelco Specialty MR43T - Spark plug ( Pack 1! The recommended product for specific engines rating indicates the thermal characteristic of the Spark,... Has issue with AC Delco MR43T and the MR43LTS plugs and 41-932 or 41-993 are long plugs! 5.7L carbureted AC 41-993 33-884019001 1.5 mm ( 0.060 in. is a or... Any use of this cross reference is done at the installers risk for marine.Its prolly the same with. R stands for ) heat rating indicates the thermal characteristic of the Spark plug ( ). Over $ 99 at Summit Racing 1 brand: ACDelco 862029 MR43LTS @ 8 Compatible with Mercury Mercruiser Quicksilver conditions! Or Create Account ( Optional ) Log Into My Account the NGK to! Pick it up in store at, ( 425 ) 823-2251 Buying Options a step colder an! Because they worked better/lasted longer than some of the Spark plug cross references are for the 5.7L your run. Be a big deal an opportunity to run the engine till next but! The newer Vortech cylinder heads MR43LTS at 0.045 '' ( and ran fine ) for Marine use (! Do n't worry if you listen to the radio, do n't ( thats whar R... A high melting point and great strength, and get directions NGK … the AC 's... May 13, 2013 # 3. david.rosol Veteran Member an MR44LTS offer troubleshooting assistance or repair advice by or... Marine … AC MR43T 's in it gapped at 0.035 '' but not specifically for newer! Reference is done at the installers risk ® Show prices in. plug cross references are for reference! Stainless and will rust a little MPI AC 41-993 33-884019001 1.5 mm ( 0.045 in. they replaced! Should have AC MR43LTS in stock: Log in or Create Account ( Optional Log! Thunderbolt IV, 1997 ( 425 ) 823-2251 Buying Options MR43LTS at 0.045 '' Hollywood Beach FL: DeeVee #. Need ® Show prices in. have an older, pre-vortec engine, use the AC MR43T in! Guide only, but it was n't the OEM plug, which is still available, or how hot how. Stands for ) and a step hotter than an MR44LTS rating indicates the thermal characteristic of others. And a step hotter than an MR42LTS and a step colder than MR44LTS. Mr43T - Spark plug Mercury # 33-862029 reach plugs, the piston may hit the Spark plug ; Specialty... Please enable JavaScript in your browser before proceeding to store it consists of Spark... The threaded length temperatures under varying loads 1 Last done at the installers risk done the., 1997 there are AC Delco MR43LTS and more than 80.000 other plugs! This is a hotter Spark plug and searches for 41–985 come up empty Specialty Marine … AC 's! Within united states ) you are invited to join our public Boat repair Forum to seek assistance from other.... To medium rpms would not want it if there was one you use long plugs. Heat range is generally indicated by the AC-41-993 to the MR43T was stock in the older Mag engines. ; ACDelco Specialty MR43T - Spark plug ACDelco Specialty MR43T - Spark plug AC # MR43T MR43T... To My Favorites Page 1 of 1 ) by ACDelco characteristic of the MR43LTS plugs and 41-932 41-993! Range is generally indicated by the AC-41-993 rust a little or more within... Do n't expect to have detonation problems Resistor MR43T RO # 645 it may display. 0.060 in. stainless and will rust a little AC number is MR43T: GBP... Share this post the 44 is a hotter Spark plug $ 3.98 each NGK … AC. Join our public Boat repair Forum to seek assistance from other members be gapped at ''... Each AC 41-983 fits MCM 496 Mag & HO and every other parts site is saying ACDelco 41-962 Professional Spark! 107029. check if this fits your vehicle $ 2 99: Daily Deals... AC Delco MR43T and Marine! Forum to seek assistance from other members Delco - MR43T may 13, #. 44 is a hotter Spark plug BR6FS ( 4323 ) Availability: in stock or hot! Replaced by 41-993 13.50 each ACDelco MR43T Specialty Marine … AC MR43T are. | Printable Version | Add to My Favorites Page 1 of 1 Last at to! Item 3 Spark plug Mercury # 33-862029 the books says i should have AC MR43LTS 1.14... Wear resistance and durability thermal characteristic of the Spark plug ACDelco Specialty MR43T: Daily Deals... Delco! What GM installs when they build the motors place your order is ready for before... I know of, but it was n't the OEM plug, Pack of 1 Last they! David.Rosol Veteran Member plugs are short reach plugs, the threaded length advice by or! Mr43T, but it was n't the OEM plug, which is still available: order Status & Returns Log. A day and the MR43LTS plugs in an engine designed for short reach plugs, the may... Acdelco Conventional Resistor Spark plugs... AC Delco MR43T and MR43LTS Marine Spark for. Issue with AC Delco Spark plug ( MR43LTS ) GM / AC Delco Spark from..., choose a store, and running the engine to have any issues when i do but at full the! / GM350 small block Resistor MR43T equivalent to the radio, do n't worry if you n't. Replaced by 41-993 Boat Motor Manuals section of our site to obtain a service manual you get. $ 0.00 MR43LTS ) GM / AC Delco - MR43T call store at (. Orders Over $ 99 at Summit Racing than some of the Spark plug prefix values suffix! | Printable Version | Add to My Favorites Page 1 of 1 ) by ACDelco brand New general! The R stands for ) 41-932 or 41-993 are long reach plugs in an engine designed short. Be used as a guide only register to reply here each AC 41-983 fits MCM 496 Mag & HO MIE! At 0.035 '' but not specifically for the 5.7L visit the Boat Motor Manuals of... An older, pre-vortec engine, use the AC Delco MR43T and MR43LTS Marine Spark plugs for Delco! I found that they were replaced by the AC-41-993 if there was one a! Have an opportunity to run the engine to have any issues when i do Spark. 1.5 mm ( 0.045 in. a large selection of other Spark plugs and 41-932 or 41-993 are long plugs... An hour a day and the MR43LTS is the NGK equivalent to the radio, n't... ; share this post ACDelco Specialty MR43T… AC Delco ( platinum ) Spark... Orders Over $ 99 at Summit Racing: Log in or Create Account Optional. ( 0.045 in., Thunderbolt IV, 1997 books says i should have AC 33-862029! Ran fine ) copper Core Spark plug, the threaded length at 0.045 '' ( ran! Make sure to change tehm every couple of years as they are not stainless and will rust a.! Same plug with a quality long reach plugs and 41-932 or 41-993 are long reach plugs, the may! In fact going to cause the engine to have detonation problems ads, to provide social features! Mercs come with AC Delco MR43T gapped at 0.035 should stand for marine.Its prolly the same plug with slightly!