Dennis Jones Posted March 15, 2019 Share Posted March 15, 2019 Does anyone know what a modern equivalent of the AC C86 spark plug would be? I ordered new plugs for my 33 Chevy Master from the Filling Station and they sent me AC Delco R45 plugs. They are completely the wrong size plugs. Here is a picture of one of the plugs from my engine next to the Filling Station plug. Thanks, Dennis Link to comment Share on other sites More sharing options...
Guest Posted March 15, 2019 Share Posted March 15, 2019 Obviously they don't know S*** from shinola. The * tells you that the threads are 18 MM and the 6 is the heat range. If it were my engine I would use NGK AB-6 plugs. When I used AC or Champion plugs I had to clean and re-gap them at 5,000 miles and replace them at 10,000. When I was driving almost 1,000 miles a month that was a lot of bother. Since I have changed to NGK, I just replace them about every 20,000 miles and have been doing so for over 300,000 miles. By the way I found the plugs in stock at the local Porsche Dealer at almost half price compared to NAPA. Link to comment Share on other sites More sharing options...
Spinneyhill Posted March 15, 2019 Share Posted March 15, 2019 According to the chart I found on the www the C86 crosses to: AC_DELCO AUTOLITE C86 375 C86 2697 C86 375 C86 377 C86 375 C86 386 C86S* 386 C86 2775 C86 3035 C86 3035 C86 3035 C86 3035 C86S* 3136 C86 376 C86 375 C86 386 BOSCH_STK. BOSCH 7548 M8AC0 champion STK 514, 515 or 516; Champion D14 or D16; NGK A6 These are 18 mm plugs with 12 mm reach and a 1" hex. 1 Link to comment Share on other sites More sharing options...
Dave39MD Posted March 15, 2019 Share Posted March 15, 2019 C87 is the current plug number and the filling station has them. Why not call them up and swap them out? Dave 2 Link to comment Share on other sites More sharing options...
TerryB Posted March 15, 2019 Share Posted March 15, 2019 Contact the vendor, mistakes happen. I’m sure they will help you out. Link to comment Share on other sites More sharing options...
AHa Posted March 15, 2019 Share Posted March 15, 2019 Another option would be to clean the old plugs, gap them, and continue to run them. Two of my cars run much better with period plugs than they do with modern replacements. Link to comment Share on other sites More sharing options...
Dennis Jones Posted March 16, 2019 Author Share Posted March 16, 2019 Thanks a lot everyone. I appreciated your help in this matter. Dennis Jones Link to comment Share on other sites More sharing options...
cahartley Posted March 16, 2019 Share Posted March 16, 2019 I'm using Champion D16 plugs gapped at .040" with great success . 1 Link to comment Share on other sites More sharing options...
drew h Posted April 16, 2019 Share Posted April 16, 2019 we have 10 C-86 plugs Coconino auto 928-774-8556 Link to comment Share on other sites More sharing options...
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