lancemb Posted July 28, 2015 Share Posted July 28, 2015 I have a box of AC R43 and a box of AC 44S. One came with my 57 and one came with some 58 stuff I bought. Are either of these correct for a 57 and 58 Buick? I'm not sure how the naming conventions have changed over the years or what it means exactly. The R43 plugs look pretty old. Link to comment Share on other sites More sharing options...
old-tank Posted July 28, 2015 Share Posted July 28, 2015 The original plug was AC 44. The 44S is the same heat range with an extended tip; both are non resistor. The R43 is slightly 'colder' and is a resistor but would work. The 44 and 44S are not available anymore. Check the ebay prices of the 44S, especially if they have green stripes...You may want to sell those to some anal retentive and just use some Autolite 85's that give me good (and cheap) service. Willie 1 Link to comment Share on other sites More sharing options...
lancemb Posted July 29, 2015 Author Share Posted July 29, 2015 The original plug was AC 44. The 44S is the same heat range with an extended tip; both are non resistor. The R43 is slightly 'colder' and is a resistor but would work. The 44 and 44S are not available anymore. Check the ebay prices of the 44S, especially if they have green stripes...You may want to sell those to some anal retentive and just use some Autolite 85's that give me good (and cheap) service. WillieThanks!! As it turns out I only have 7 of the R43s; I'll check and see if either are valuable and may take your advice. I'm with ya; something such as a spark plug that will not be seen and not provide better performance than what I can buy at Autozone does not matter to me, and I am pretty tight on originality. Link to comment Share on other sites More sharing options...
Airy Cat Posted July 29, 2015 Share Posted July 29, 2015 I have been using the Autolite 85s for the last 20 years in all of my Buicks with no problems. Link to comment Share on other sites More sharing options...
Larry Schramm Posted August 14, 2015 Share Posted August 14, 2015 There is limited true AC spark plugs available as the plant is now nothing more than a concrete covered lot. The spark plug department used to be to the left of the baloon marker. https://www.google.com/maps/search/ac+spark+plug+plant+flint+michigan/data=!4m2!2m1!4b1?dg=dbrw&newdg=1 Link to comment Share on other sites More sharing options...
lancemb Posted September 7, 2015 Author Share Posted September 7, 2015 Does anyone know if C44S is the same as 44S? Link to comment Share on other sites More sharing options...
old-tank Posted September 7, 2015 Share Posted September 7, 2015 Same heat range and should work the same. "C" stands for commercial and those that I have seen seem to have heavier electrodes, which would not be a bad thing. Link to comment Share on other sites More sharing options...
lancemb Posted September 7, 2015 Author Share Posted September 7, 2015 Thank you! Link to comment Share on other sites More sharing options...
JamesBulldogMiller55Buick Posted September 8, 2015 Share Posted September 8, 2015 (edited) If you're going to plat your radio while driving, get the resistor plugs.... Edited September 8, 2015 by JamesBulldogMiller55Buick (see edit history) Link to comment Share on other sites More sharing options...
lancemb Posted September 8, 2015 Author Share Posted September 8, 2015 If you're going to plat your radio while driving, get the resistor plugs....Why is this? What does that do for me? Wouldn't the original work fine?I ordered a set of C44S off Ebay for $12 shipped (how can you beat that?) Link to comment Share on other sites More sharing options...
60FlatTop Posted September 8, 2015 Share Posted September 8, 2015 I used to have a big bag of sooty AC44's in a cabinet. They were generally the recommended plug for my collector Buicks over the years. I started using AC45's and that range stayed looking good for 8 or 9 years. About 5 or 6 years ago I started tossing my AC45 on the parts counter and asking for an NGK that looked like a similar heat range. That has been working fine for me. I think the 44's were a bit cool for collector car use. Bernie Link to comment Share on other sites More sharing options...
old-tank Posted September 8, 2015 Share Posted September 8, 2015 I used to have a big bag of sooty AC44's in a cabinet. They were generally the recommended plug for my collector Buicks over the years. I started using AC45's and that range stayed looking good for 8 or 9 years. About 5 or 6 years ago I started tossing my AC45 on the parts counter and asking for an NGK that looked like a similar heat range. That has been working fine for me. I think the 44's were a bit cool for collector car use. BernieAC44 would probably be just right for high speed driving with E10 fuel; for slow cruising AC45 or 46 (or equivalent) would be right. A set of AC44S lasted 30k mile in one of mine.The stock radio will be fine if all the plug wires are seated in the distributor and on the plugs, the proper capacitors if used are on the generator, coil and voltage regulator and if the antenna sheath is grounded.I went to resistor plugs on the cars I installed a cruise control...just enough interference to disable or cause malfunctions.lancemb made out like a bandit on those plugs!Willie Link to comment Share on other sites More sharing options...
JamesBulldogMiller55Buick Posted September 9, 2015 Share Posted September 9, 2015 AC44 would probably be just right for high speed driving with E10 fuel; for slow cruising AC45 or 46 (or equivalent) would be right. A set of AC44S lasted 30k mile in one of mine.The stock radio will be fine if all the plug wires are seated in the distributor and on the plugs, the proper capacitors if used are on the generator, coil and voltage regulator and if the antenna sheath is grounded.I went to resistor plugs on the cars I installed a cruise control...just enough interference to disable or cause malfunctions.lancemb made out like a bandit on those plugs!WillieI'll check that stuff out on mine...I'll start with checking the wires on the plugs.. Link to comment Share on other sites More sharing options...
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