Racing Plugs Comparison Chart

Size	Heat Range	Champion	AC	Motorcraft	Bosch	Lodge	NGK	K.L.G.
14mm		L-88A	S42F	AE 2x	W175 T1	2HN	B7 HS
1/2 inch reach		L-81	S41F	AE 1X	W240 T1	3HN	B8 HS
standard gap		L-78			W260 S11S
		L-77J	S40F	AE901x	W260 T1		B9 HS

14mm		L-62R		AE23	X240 S1S	R47	B8 HN	F 220/F250
1/2 inch reach		L-60R		AE903	W260 S1S	R49	B9 HN	F 260
		L-57R		AE603	W280 S1S/W310 S1S	R50	B10 HN	F 280
		L-54R		AE403	W340S1S/W370 S1S	R51	B11 HN	F 320
				AE203				F 340

14mm		N-5	44 N	AG3	W175 T2	HNLHL 14	B6 ES	FE 70
3/4 inch reach			44 XL			HLNP		FE 75
		N-4	C42N/C41N	AG2	W225 T2	2HLN	B7 ES	FE 80
		N-3	43 XL	AG901	W260 T2	3HLN	B8 ES	FE 100
		N-2	S41 XL	AG701	W260 T2	3HLN	B9 ES	FE 220
		N-60		AG701			B10 ES
		N-57		AG501

14mm		N-66Y		AG22		2 HLNY
3/4 inch reach		N-7Y/N65Y		AG12		2 HLNY
P.C.N.		N-6Y/N-64Y			W260 T28	3 HLNY	B77 EC	FE 125P
		N-63Y				4 HLNY
		N-60Y				5 HLNY

14mm		N-4G	S43 XL	AG2M	WG235 T28		BP6 EV
3/4 inch reach		N-3G	S42 XL		W250 P21		BP7 EV
Gold Palladium		N-2G	S41 XL		W265 P21		BP8 EV
		N-59G/N-84G					BP8 EV
		N-57G/N-82G					BP9 EV
		N-5G/N-80G					BP10 EV

14mm		N-62R		AG 23	W240 S2S	RL47	B8 EN	FE 220
3/4 inch reach		N-60R		AG 903	W260 S2S	RL49	B9 EN	FE 260
		N-57R		AG 603	W310 S2S	RL50	B10 EN	FE 280
		N-54R		AG 403	W340 S2S	RL51	B11 EN	FE 310
		N-52R/N77R		AG 203/AG 103	W370 S2S/W400S2S	RL53	B12 EN	FE 340

14mm		J-6J	M44 C	A3X	W225 T3	HAN	B6	FS 75H
3/8 inch reach			M44	A3XM		HANP
		J-4J		AT2/A21XM	W240 T3	2HAN	B7	FS 100H
			M42 K	A2X/A21X
		J-2J	M41 K/M41G	AT1	W260 T3	3HAN	B77 C	FP 100
		J-79		A901

14mm		UJ-10Y	C44 S	AT 42	W145 T7	CANY	BP-6	FP 55P
3/8 inch reach			435	A 32
P.C.N.		J-63Y	425	A 22
		J-61Y	C421	A12
		J-83Y

You may also like to read an article about Racing Plugs by Keith Gough, Development Engineer at K.L.G. Oliver Lodge (1851 - 1940) invented electric spark ignition (the Lodge Igniter). His two sons developed the idea and founded the Lodge Plug Company. Lodge is also known for his pioneering work in radio and was the first man to transmit a message by wireless.