BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Jun 2023 Posts: 100 'Bolter | | 'Bolter Joined: Jun 2023 Posts: 100 | What spark plugs would you suggest to run in the 235 engine???
Running on 6 volts and with single barrel carburetor.
52 Chevy 3100
Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me." -John 14:6
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | AC 44 or R44, or the equivalent interchange number for Champion or NGK. NOT 44T- - - -that's a tapered seat plug with a 5/8" wrench size. 44 has a 13/16" size and a flat copper gasket. AC 45 is OK if you don't do a lot of high speed highway travel. It's a little hotter than a 44. The "R" prefix indicates "resistor"- - - -either one is OK. RUN- - - -do not walk away from Prestolite plugs.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2014 Posts: 3,504 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,504 | You’ll have a hard time finding R44/R44s in anything but NOS form. And the NOS tend to be pricey.
sparkplug-crossreference.com is handy for finding interchanges.
1951 3100
| | | | | Joined: Oct 2021 Posts: 5,684 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 5,684 | AC R43 is the in service replacement for the discontinued AC R44 and work fine on Ol' Roy, The Bismarck, and The Purple Knif.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Jan 2002 Posts: 2,696 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,696 | My spoiled green turd (truck) uses AC C44S plugs. Been working fine for quite a few years now.
Craig My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
| | | | | Joined: Dec 2017 Posts: 1,609 'Bolter | | 'Bolter Joined: Dec 2017 Posts: 1,609 | 5913 or 848 head, champion J12y, RJ12Y, J12YC, RJ12YC, or the J14Y variant.
Mike
| | | | | Joined: Jun 2023 Posts: 100 'Bolter | | 'Bolter Joined: Jun 2023 Posts: 100 | Mike,
It has the 848 head. The engine is actually a 1961 but it's in my 1952 truck.
52 Chevy 3100
Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me." -John 14:6
| | | | | Joined: Aug 2017 Posts: 566 'Bolter | | 'Bolter Joined: Aug 2017 Posts: 566 | I run AC 44 or AC C44 Originals in my 1958 235 in my 1950 truck, 6 volt. Runs great!
The "C" is for commercial
You can still find them on E Pay..ect.
I saw some for a good price earlier. Shop around.
Todd
1950 Chevy 3100
| | | | | Joined: Dec 2017 Posts: 1,609 'Bolter | | 'Bolter Joined: Dec 2017 Posts: 1,609 | Then the J12Y variant would be a good option. Just as a historical reference, the J12Y plug was used in 283 chevys, Mopar motors, Harley Motorcycles, all kinds of engines. The J12Y plugs are the original variant (along with the R designation for resistor to keep radio noise down). the J12YC (C for copper) are the newer and current variant. Any of them will work.
The J14Y are the same plug but hotter (not in terms of spark but in terms of thermal temperature). Also fine to use if you cant find the J12Ys locally.
You might see J11Y and J10Y on ebay or facebook market place. These were colder plugs, generally for commercial use, taxis, trucks, but no longer available. Also used by racers for race motors. I scrounge them up when I come across them as I have used them for racing.
Mike
| | | | | Joined: Jun 2023 Posts: 100 'Bolter | | 'Bolter Joined: Jun 2023 Posts: 100 | I’m currently running AC Delco R45. Does anyone think these will be too hot? They seem to work well but I just put them in and have only driven it about 15 miles with them.
52 Chevy 3100
Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me." -John 14:6
| | | | | Joined: Jan 2014 Posts: 3,504 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,504 | Awful lot of folks around here running AC R45.
1951 3100
| | | | | Joined: Jul 2014 Posts: 854 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 854 | The 261 I bought from a Wisconsin wrecking yard came to me with C43 AC plugs, 848 head on a 261. Based on the yellow color I believe it had done its service in a 56 2-ton. Years ago I ran C42-1 in the fleet's 270 powered GMC dump truck and my pickup. Since I couldn't find those commercial plugs anymore I used Champion RJ10Y. Bought two sets when I found them. They stay clean and white despite ~10,000 miles on them.
1951 3800 1-ton"Earning its keep from the get-go"In the DITY Gallery1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971. | | |
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