Spark plug comparison chart . 2544 is the coldest plug in that plug family, and 2546 is the hotest. Ac delco spark plug spark plug cross reference heat range chart chion 792 c59yc 14mm spark plug what heat range spark plug do you run 21 unique spark plug cross reference chartHeat Range Conversion ChartSpark Plug Cross Reference Heat Range ChartCant Find Ac Plug Heat Range Chart Hot Rod ForumHot Rods Ac Spark Plugs Page […] for the common std SBC AC delco plugs.. R45TS is known as stock heat range on most engines.. high number is hotter, lower number is colder.. R44TS would be 1 step colder if plugs are too hot, it can help to cause detonation/pre ign. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat … Spark plugs holley performance s acdelco rapidfire platinum spark plug ngk laser platinum spark plugs spmr8a6hdgSpark Plug Cross Reference Heat Range ChartHeat Range Conversion ChartAc Delco Spark Plug Heat Range Chart LasvegCant Find Ac Plug Heat Range Chart Hot Rod ForumSpark Plug Cross Reference Heat Range ChartAc Delco Spark Plug Heat Range Chart … Anonymous. Notes. To cut to the chase before getting into the details, the best advice for a performance street engine is to put the hottest plug in the engine that will survive . The spark plug is what started it all for ACDelco. The optimal temperature to remove carbon deposits from the tip of the spark plug is 450º - 500ºC. 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. 41-808 gap = .047" 41-808 reach = .75" 41-905 gap = .035" 41-905 reach = .43" Due to different engine modifications and conditions,a hotter or colder spark plug may be required. Not intimately familiar with the Accell numbering scheme, but you should probably be able to figure out which one would be close in terms of heat range, given that info. 5 (0) 1999-2005 Buick LeSabre Spark Plug Wire Set - By AC Delco USD $35.27. 3.Part number 276S may be used for Header applications in place of P/N 276. Use the correct deep socket size to loosen each spark plug one or two turns. 1 decade ago. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Use this handy chart to determine the best spark plug for your heat range selection, or cross reference the racing spark plug you are currently using to try a different brand of spark plug. 0 0. The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made. The heat rating indicates the thermal characteristic of the spark plug, or how hot or how cold the spark plug is. The ACDelco heat range chart is a chart that provides the heat rating in addition to other characteristics of the ACDelco spark plugs. To ensure correct spark plug application verify V.I.N.code on vehicle. The heat range of a spark plug is its ability to transfer heat from the combustion chamber to the cylinder head. 48 replacement spark plugs for AC Delco 41-603. Heat range is important because too hot of a heat range can create . Although the cost of iridium spark plugs gets offset by the added longevity that you get with the product, paying $15 x eight for a V8 engine can get to be a costly experience for some vehicle owners. Spark Plug Heat Range Cross Reference . 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. Spark Plugs. The difference between one heat range to the next represents the ability to remove 70º - 100ºC. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. 1 decade ago. 4 (0) 2001-2005 Pontiac Grand Am Spark Plug Wire Set By AC Delco Most spark plug manufacturers recommend that the tip temperature remain between 500-850 degrees Celsius. Why is spark plug heat range important? The kind of firepower you expect from ACDelco. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974. This ultra-wide heat range prevents spark plug overheating while providing reliable starts. This is most commonly done by changing the contact area of the porcelain insulator nose to the shell during manufacturing. Locate which ACDelco spark plug matches you. A. If you need the NGK Spark Plug list, click here. HIGHER IGNITABILITY ... heat dissipation in a spark plug 98% copper core TOP MARINE CROSS REFERENCES I understand iridium may be too hot for the aluminum heads. engine damaging pre ignition. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. ngk spark plug upgrade chart original plug stock no. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. Heat range is the speed at which a spark plug can transfer heat from the firing tip to the cylinder head water jacket and into the cooling system. So 4 is a notch or two colder than stock. Heat range on AC Delco Spark Plugs? 4.5 (0) 2000-2009 Chevrolet Tahoe Spark Plug Heat Shield - By AC Delco USD $11.29. I think on delco's the higher the number the hotter the lpug. Re: What to use that is hotter than R45 AcDelco Plugs [ Re: brino ] #341354 04/27/15 12:12 PM AC-Delco Part # NGK Part # NGK Stock # 41-932 PZTR5A-15 7862 ... amounts of heat. Im tring to find a list of ac delcos spark plug heat ranges,I even looked on ac delco site but no luck. pgr7a 3200 n/a - igr7a 6687 plfr6a-11 7654 n/a - ilfr6t11 4904 pltr6a-10g 3587 n/a - iltr6a-13g * 3789 plzfr6a-11s 5987 n/a - ilzfr6d11 1208 plzkbr7a-g (disc'd) 5843 n/a - ilzkbr7b8dg 95770 However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974. This means the spark plug will heat up easily and reach its optimal operating temperature. Place your order online today and pick it up in store at your convenience. Source(s): heat range ac delco spark plugs: https://shortly.im/nfqE2. If too cold they will foul out, carb load up and flood engine out Dan. Both of those jetting combinations give good power (tested on a long 11% grade near my home), economy and cool running and you may find the plug color interesting. I am leaning toward the 41-905 plug. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. From the old to the new and even the nonautomotive, ACDelco has spark plugs to fit just about every need. Now, with over 100 years of innovation behind each spark plug, you know you’re covered. In these instances, a colder plug may be needed. Which spark plug is hotter, the 43, 44 or 45? ACDELCO Ignition : Spark Plug Auto Parts ALL THE PARTS YOUR CAR WILL EVER NEED Show Prices In US Dollars ($) 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$) Spark plugs cross reference chart oe iac control page 3 offsonly chevelle spark plugs the ac delco spark plug decoder table chion l77jc4 brp 502194 821 Spark Plug Cross ReferenceSpark Plug Cross ReferenceTech Tip Spark Plug Heat Range Cross ReferenceSpark Plug Cross Reference21 Unique Spark Plug Cross Reference ChartCross Reference E3 Spark PlugsStealth 316 … Product details, choose a store, and 2546 is the coldest plug that... Correct spark plug tip range is too cold, the spark plug brands list, click here ultra-wide range. Verify V.I.N.code on vehicle ) 2001-2005 Pontiac Grand Am spark plug is what started all! 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