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Last year I bought a running 216 engine at a swap meet, and in addition to the plugs in the engine, there were also 5 AC M-8 spark plugs in a box. Was the AC M-8 the original plug for the 216?
Sid
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I believe the plug for the original 216 (1937) was an AC 46. That's the plug that my '38 left the factory with.
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Yes the 41 to 48 came with the M-8 plugs.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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A friend gave me another set of M-8's. Both sets have insulators that are white with AC M-8 on them, but one set also has green stripes on the insulators. Which plug is the original, and which came out later?
Sid
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I believe the original plug was an AC 104.  
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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The 1946-1948 came with the M-8. The 104 and 106 came in the 1941 and 1942 models. After 1948 the 104-106 was discontinued and the M-8, which was much improved, was sold for replacement in 1941-1942 models.
Gene Schneider
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Thanks guys. I appreciate the help.
Sid
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The smooth plus with the M-8 I am of the understanding are the original plugs. The ringed plugs came out much later.
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The ribbed AC plugs were first used by Chevrolet in 1956. The M-8 ribbed version probably came along at that time also.
The ribbs did two things. Helped to eleminate a spark running down the side of the plug and made a better seal for the boot that was used on all applications by that time.
Gene Schneider
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Shade Tree Mechanic
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I believe the plug for the original 216 (1937) was an AC 46. That's the plug that my '38 left the factory with. The owners manual for 1937 lists the one year only plug as AC k-11
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The plugs numbered 44, 45 46,etc. were new for 1938.
Gene Schneider
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Thanks gents, I stand corrected.
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Some time ago I put together a chart of spark plug types by year and model.
I don't guarantee it is 100% accurate but should be close.
Original plugs
Year; Model; Type, Size & Line; Notes
1910-12; Whiting; A.L.A.M Auburn; 7/8” 2-piece
1912; Little 4; Standard AC; AC porcelain
1913-14; Little, C,L; Standard AC; AC-1 porcelain
1914; D,H; Long 7/8” AC; AC-1 porcelain
1914; H; Long 7/8” AC Titan; Non-sep. '14 style
1915; M-2,S-B-C; Reg. 7/8” AC CICO; Fancy AC Logo
1915-17; H,F; Long 7/8” AC Titan; Fancy AC Logo
1916-17; 490,M-2,3; Long 7/8” AC CICO; Fancy AC Logo
1916-17; S-B C; Long SAE AC Titan; Fancy AC Logo
1916-17; S-B D; Long Metric AC Titan; Fancy AC Logo
1918; S-B H; Long Metric AC Titan; AC letters
1918-19; FA,FB,D,S-BG; Long 7/8” AC Titan; AC letters
1918-19; 490; Long 7/8” AC CICO; AC letters
1920-25; All; 7/8” Long AC Titan; No. 78LT
1926-27; Series K, V, A; AC type B
1928; All; AC type Z
1929; All; AC G
1930; All; AC G-14, G-12 start (11/30)
1931; All; AC G-12
1932; All; AC G-12, G-10 start (3/32)
1933; All; K-9
1934; Master; K-10
1934; Standard; K-9
1935-37; ; K-11
1938-39; ; 46
1940; ; 44
1941-42; ; 104
1946-48; ; M8
1949-50; ; 44-5
1951-52; ; 46-5
1953-54; ; 44-5
S-B is Scripps Booth
How Sweet the roar of a Chevy four!
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You are invited to post this information under the Tech Talk thread.
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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If it could be posted as a table then it would be much easier to understand. Don't know how to get that done.
How Sweet the roar of a Chevy four!
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Again, thanks guys. This web site is great!
Sid
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How Sweet the roar of a Chevy four!
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Good job Chip. This would be a cool list for us to expand by another 20 years or so.
But then maybe we should post it in the MEMBERS area (Resource Center).
Just a thought. Maybe others will want to join in on it.
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The list is the standard plug for passenger and in most years 1/2 ton trucks. Taxis, delivery and other slow speed vehicles often used a hotter plug. An example is the 108 plug was used for the '41-'42 taxis, etc. Newer than 1954 gets more complicated as there generally were many more spark plugs used. I have a bunch of that information but never put it in the table. Hope everyone feels free to add to the list or make corrections.
How Sweet the roar of a Chevy four!
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