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What is the number plug that came new in a 1930?
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Backyard Mechanic
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Well make up your mind is it a G-14 or G-12? Just kidding. What was the determining factor as to whether the G-14 or G-12 was used? Climate, altitude....? Thanks. 
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. B.F.
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Early and late. A change was made during 1930 production from G14 to the colder G12 plugs which were used through 1931. Early '32 used the G12 plugs but were soon replaced by the AC G10 plugs.
How Sweet the roar of a Chevy four!
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Chipper is dead on. That is why I said G-14 or G-12 because, as Chippy Dippy indicated, there was an early and a late plug for 1930. Buy the way, the G-10 plug came into service for the 1932 models around February of 1932.   
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Shade Tree Mechanic
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Shade Tree Mechanic
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I understand there were two types used in 1929? What were they and when were they used? Merry Christmas everyone! 
Docs Popcorn Co
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The Mangy Old Mutt
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Shade Tree Mechanic
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Did they use the same plugs on the 1 1/2 ton truck in 1929? If you brought your 1929 car or truck in for service in 1930 did they still use a G-14 or did they make a change in recommendation as they learned more about their new engine? 
Docs Popcorn Co
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As mentioned above, that was the only plug used in 1929 so it was used on both cars and trucks because the engines were the same, so were the carburetors, distributors and etc. It depended upon the customer and the dealer if the plugs were changed as an upgrade. With the depression just starting I doubt if the plugs were changed unless they were worn out.
The Mangy Old Mutt
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Skip or Chip,
How many years do you know the correct plug for? I would think that would be good refference material.
Bruce
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The Mangy Old Mutt
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I have a list somewhere of the correct spark plugs from 1912 to the 50s. Guess we could put together one for all Chevrolets up to modern vehicles. Anyone game?
How Sweet the roar of a Chevy four!
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Chipper - "Anyone game??" Not if you're carrying a gun!!! Jim 
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No gun, just bow and arrow, tomahawk and bowie knife. Still game?
How Sweet the roar of a Chevy four!
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Looks like you've got all bases covered. I may be game, but I refuse to be "Still".
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Chipper is dead on. That is why I said G-14 or G-12 because, as Chippy Dippy indicated, there was an early and a late plug for 1930. Buy the way, the G-10 plug came into service for the 1932 models around February of 1932. The G-10 spark plug was also available in 1931 , and is mentioned in the May 1931 CSN as being used if high speed driving and different fuels where used with anti knock or pre ignition problems. but not for normal driving conditions.
JACK
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Shade Tree Mechanic
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Just checking I've got this right....
I've checked on the Filling Station website and they list the AC Delco C87 plug for the 29 - 32 models.
I also can't find any reference on the FS site to a G-12 or G-14.
What manufacturer made the G-12 & G-14?
Andrew
While the rest of the crew may be in the same predicament, it's almost always the pilot's job to arrive at the crash site first.
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G10 ,G12 etc are original spark plugs fitted at manufacture to 1931 and 1932 chevrolets and manufacture by the AC Spark Plug Company (part of GM).The plugs are now long discontinued, but sort after for authentic restorations and original unrestored cars.
1932 chevrolets in Australia were originally fitted with Pyrox brand part number P7
JACK
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Shade Tree Mechanic
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G10 ,G12 etc are original spark plugs fitted at manufacture to 1931 and 1932 chevrolets, now long discontinued, but sort after for authentic restorations and original unrestored cars.
1932 Ahhh.... so the replacement option for my daily driver (non-show car) would be the C87. Thanks bloke, that saves me wondering what I'd missed!
Andrew
While the rest of the crew may be in the same predicament, it's almost always the pilot's job to arrive at the crash site first.
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Yes, they are a modern new replacement plug .
JACK
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I had to abandon the car I intended to take to Flint. So I drug out the 25 Roadster and blew the dust off. I did a tuneup and it ran exceptionally well. It had AC 78S plugs. I set the timing and adjusted the carburetor.
As I continued to clean and adjust I ran across a bag under the seat with some new plugs in it. I decided to change the plugs and see if it made any difference. It started great and after letting it run for a while I had to reduce the RPM as the new plugs apparently were so much better as to make the engine faster. I took it for a test drive and you can be assured it will have those plugs in it when I arrive.
New plugs: Autolite 3077
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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JACK
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Autolite 3076 plugs are the equivalent of a Champion W16Y,which is Champion's listed plug for Chev 4's,but though the heat range may be correct,they have far too short a reach compared to the 3077's or the AC 78S plugs.The 3076 plugs are more suited to the engines of those blue oval brand of car. 
CJP'S 29
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Ray,
Some of us have been using the 3077 plugs in the 4 bangers for many years. I know they have been discussed in the 4 cylinder tour seminars on several occasions. Guess that is why you got a set. The old philosophy of if it is working well don't mess with it may not be the best in all cases. So the old dog just got a new trick? Sorry couldn't help the opportunity to break out all those old saws, so to speak!
I had been running some short reach AC plugs (don't remember exactly which number) in the '28 Canopy Express. Got a set of 3077s as Bill Bradford "tooted their horn". I had only passed one vehicle on an upslope on previous tours but after changing plugs was able to pass several. That convinced me to also be an advocate of the Autolite 3077 to help the roar of a Chevy 4.
How Sweet the roar of a Chevy four!
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