Conventional Spark Plug Engine Recommendations

STITT Spark Plug Engine Recommendations
for
Conventional (Standard) Plugs

Click on the manufacturer of your engine.
AJAX (Cooper Energy Services)	ARIEL
ARROW	CATERPILLAR
CLARK (Dresser Clark)	COOPER-BESSEMER
CUMMINS	CUMMINS NATURAL GAS ENGINES
DEERE POWER SYSTEMS	DELAVAL (Transamerica)
DETROIT DIESEL	DRESSER-RAND
ENTERPRISE (Also see DeLaval)	FAIRBANKS-MORSE (Coltec)
FORD INDUSTRIAL POWER UNITS	GEMINI
GENERAL MOTORS POWERTRAIN	HERCULES
INGERSOLL-RAND	KUBOTA
LISTER PETTER	LORAIN
LUFKIN	M.E.P. INDUSTRIES
MINNEAPOLIS-MOLINE	NORDBERG (Hatch & Kirk)
OILWELL	SUPERIOR (Cooper Energy Services)
WAUKESHA	WORTHINGTON

AJAX (Cooper Energy Services)

Engine Model	Plug Gap	STITT Part No.	Reach
C30, C40, C42, CMA, E-15	.025"	19	5/8"
EA15, E30, EA30, E42	.025"	19	5/8"
DP60, DPC60, DP80	.025"	79	.870
DPC80, DPC105, DP115	.025"	79	.870
DP125, DPC140, DP160	.025"	79	.870
DPC160, DPC162, DP165	.025"	79	.870
DPC180, DPC230, DPC280	.025"	79	.870
DP300, DPC300, DP325	.025"	79	.870
DPC360, DPC540	.025"	79	.870
DPC600, DPC800	.025"	79	.870
2801, 2802, 2803, 2804	.015"	R107*	5/8"
Pre-combustion chamber modifications & LE engines	.015"	R107*	5/8"

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ARIEL

Engine Model	Plug Gap	STITT Part No.	Reach
162JGS/1, 325JGS/1	.015"	407XL / R407XL*	3/4"

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ARROW

Engine Model	Plug Gap	STITT Part No.	Reach
C-46, C-66, C96, C106, C245, C255	.025"	8MEX	1/2"
L-795, L-1770, L-2165	.025"	17EX	5/8"

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CATERPILLAR

Engine Model	Plug Gap	STITT Part No.	Reach
G-333, G-3304, G-3306
1/2" REACH CYL. HEADS	.015"	407L / R407L*	1/2"
3/4" REACH CYL. HEADS	.015"	407XL / R407XL*	3/4"
G-343	.015"	407XL / R407XL*	3/4"
G-342, G-353, G-379	.015"	407L / R407L*	1/2"
G-397, G-398, G-399	.015"	407L / R407L*	1/2"
3400 SERIES	.015"	407XL / R407XL*	3/4"
3500 SERIES	.012"	RB77C	.812"
3600 SERIES	.012"	RB77C	.812"

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CLARK (Dresser Clark)

Engine Model	Plug Gap	STITT Part No.	Reach
RA, RAS, HRA, HRAT	.015"	107 / R107*	5/8"
MA, HMA	.015"	107 / R107*	5/8"
BA, HBA, HBAT, TLA, TCV	.015"	107 / R107*	5/8"
HLA, HLAT, TMB, TRA	.015"	107 / R107*	5/8"
Pre-combustion chamber modifications		Consult STITT Factory

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COOPER-BESSEMER

Engine Model	Plug Gap	STITT Part No.	Reach
GMV, GMVA, GMVC, GMVE, GMVH, GMW, GMWA, GMCA, GMWH, GMX, GMXD, GMXE, GMXH, V-250, V-275 W-330, Z-330, QUAD
Short Reach (5/8")	.015"	107 / R107*	5/8"
Long Reach (7/8")	.015"	717 / R717*	.870"
LS, LSV 5/8" Reach	.015"	107 / R107*	5/8"
LS, LSV 7/8" Reach	.015"	717 / R717*	.870"
LS, LSV 1-1/8"-12 Heads	.015"	912 / R912	.620"
JS	.015"	107 / R107*	5/8"
Jet Cell® Pre-Combustion Chambers	.010"	R717**	.870"

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CUMMINS

Engine Model	Plug Gap	STITT Part No.	Reach
GNHC-4, GNH-220 3/8" Reach	.020"	447	3/8"
GNH-250, GV-12450 3/8" Reach	.020"	447	3/8"
GM-12-525 3/8" Reach	.020"	447	3/8"
GNHC-4, GNH-220 1/2" Reach	.020"	407L / R407L*	1/2"
GNH-250, GV-12450 1/2" Reach	.020"	407L / R407L*	1/2"
GM-12-525 1/2" Reach	.020"	407L / R407L*	1/2"
L10	.015"	R407XLC*	3/4"
"B" Series	.015"	R407XLC*	3/4"

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CUMMINS NATURAL GAS ENGINES

Engine Model	Plug Gap	STITT Part No.	Reach
G-495, G-743, G-855	.020"	407XL / R407XL*	3/4"
G-1710, GTA-743, GTA-855	.020"	407XL / R407XL*	3/4"
GTA-1710	.020"	407XL / R407XL*	3/4"
GTA-19	.020"	R407XLC*	3/4"
GTA-28	.020"	R407XLC*	3/4"

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DEERE POWER SYSTEMS

Engine Model	Plug Gap	STITT Part No.	Reach
6076AFN	.015"	R407XLC*	3/4"

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DELAVAL (Transamerica)

Engine Model	Plug Gap	STITT Part No.	Reach
HV-8, HVA-8, HV-12, HVA-12	.015"	717 / R717*	.870"
HV-16, HVA-16, HVA-20, HA-6	.015"	717 / R717*	.870"

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DETROIT DIESEL

Engine Model	Plug Gap	STITT Part No.	Reach
S-30G	.020"	R407XLC*	3/4"
S-50G, S-60G		Consult STITT Factory

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DRESSER-RAND

Engine Model	Plug Gap	STITT Part No.	Reach
KVGR	.015"	107 / R107*	5/8"
KVSR, KVSE, KVR	.015"	E72 / RE72*	5/8"
TCVD, TLAD	.015"	107 / R107*	5/8"
Pre-chamber modifications		Consult STITT Factory

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ENTERPRISE (Also see DeLaval)

Engine Model	Plug Gap	STITT Part No.	Reach
All engines with 18mm 13/16" Reach
Cylinder Heads	.015"	RB77C	.812"

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FAIRBANKS-MORSE (Coltec)

Engine Model	Plug Gap	STITT Part No.	Reach
OP38 Series	.010"	R807**	1/2"

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FORD INDUSTRIAL POWER UNITS

Engine Model	Plug Gap	STITT Part No.	Reach
VSG 411 (1.1 Liter/67 C.I.D.)	.015"	R407XL*	3/4"
VSG 413 (1.3 Liter/79 C.I.D.)	.015"	R407XL*	3/4"
LSG 423 (2.3 Liter/140 C.I.D.)	.015"	RF407XLC*	.708"
CSG 649 (4.9 Liter/300 C.I.D.)	.015"	RF840	.460"
CSG 850 (5.0 Liter/302 C.I.D.)	.015"	RF407L*	.460"
WSG 858 (5.8 Liter/351 C.I.D.)	.015"	RF407L*	.460"
LSG 875 (7.5 Liter/460 C.I.D.)	.015"	RF407L*	.460"

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GEMINI

Engine Model	Plug Gap	STITT Part No.	Reach
G26, G35	.020"	407L / R407L*	1/2"

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GENERAL MOTORS POWERTRAIN

Engine Model	Plug Gap	STITT Part No.	Reach
2.2L (133 C.I.D.)	.015"	RF407XL*	.708"
4.3L (262 C.I.D.)	.015"	RF407L*	.460"
5.0L (305 C.I.D.)	.015"	RF407L*	.460"
5.7L (350 C.I.D.)	.015"	RF407L*	.460"
7.4L (454 C.I.D.)	.015"	RF407L*	.460"

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HERCULES

Engine Model	Plug Gap	STITT Part No.	Reach
G-1600	.020"	407 / R407*	3/8"
G2300, G3400	.020"	407 / R407*	3/8"
G4800	.020"	407XL / R407XL*	3/4"

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INGERSOLL-RAND

Engine Model	Plug Gap	STITT Part No.	Reach
JVG, KVG, KVGR, KVT, PJVG, PKV	.015"	107 / R107*	5/8"
PKVGR, PKVT, PSVG, PVG, SVG	.015"	107 / R107*	5/8"
KVR, KVS, KVSR, KVSRA	.015"	E72 / RE72	5/8"
PKVR, PKVSR	.015"	E72 / RE72	5/8"
7/8"-18 Heads 7/8" Reach	.015"	717 / R717*	.870"
7/8"-18 Heads 1" Reach	.015"	707 / R707*	1"

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KUBOTA

Engine Model	Plug Gap	STITT Part No.	Reach
KNG1600E, KNG3200E	.015"	42XL / R42XL*	3/4"

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LISTER PETTER

Engine Model	Plug Gap	STITT Part No.	Reach
HR2G, HR3G	.015"	807 / R807	1/2"

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LORAIN

Engine Model	Plug Gap	STITT Part No.	Reach
30, 37, 40, 50	.020"	847 / R847	1/2"
A, L, O, R 7/8"-18 Heads	.015"	107 / R107	5/8"

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LUFKIN

Engine Model	Plug Gap	STITT Part No.	Reach
GSC	.020"	17EX	5/8"
GSD, GSDH, HC333, HT333	.020"	17EX	5/8"
H795	.015"	17EX	5/8"
H1770, H2165	.015"	17EX	5/8"

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M.E.P. INDUSTRIES

Engine Model	Plug Gap	STITT Part No.	Reach
M.E.P. 6, 8, 10, 12	.010"	R807**	1/2"

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MINNEAPOLIS-MOLINE

Engine Model	Plug Gap	STITT Part No.	Reach
HD-336-4A, HE-425-6A	.015"	807 / R807	1/2"
HD-504-6A, HD605-6A	.015"	807 / R807	1/2"
HD-800-6A, HDT-800-60A	.015"	807 / R807	1/2"
HD-1210, HD-1600	.015"	807 / R807	1/2"
All with 7/8"-18 Heads	.020"	13	1/2"
All with 14mm Heads	.020"	447	3/8"

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NORDBERG (Hatch & Kirk)

Engine Model	Plug Gap	STITT Part No.	Reach
FSE96	.012"	RB77C	.812"

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OILWELL

Engine Model	Plug Gap	STITT Part No.	Reach
All 18mm Heads	.020"	897	1/2"

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SUPERIOR (Cooper Energy Services)

Engine Model	Plug Gap	STITT Part No.	Reach
6G510, 6G825, 8G825	.020"	847 / R847*	1/2"
12G825, 16G825	.020"	847 / R847*	1/2"
6GT510, 6GTL, 80G6, 80GX6	.020"	807 / R807*	1/2"
6GX825, 6GT825, 8GT825	.020"	807 / R807*	1/2"
8GTL, 80G8, 80GX8, 8GX825	.020"	807 / R807*	1/2"
12GT825, 12SGT, 12GTL	.020"	807 / R807*	1/2"
16SGT, 16GTL, 16GT825	.020"	807 / R807*	1/2"
All GTLA-GTLB Models (Pre-chamber)	.020"	807NP / R807NP***	1/2"
All 7/8"-18 Heads	.020"	107 / R107*	5/8"

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WAUKESHA

Engine Model	Plug Gap	STITT Part No.	Reach
F1197	.020"	82	1/2"
F817G (14mm Heads)	.020"	487 / R487*	3/8"
F817G (18mm Heads)	.020"	847 / R847*	1/2"
F1905, H2476	.015"	807 / R807*	1/2"
H2475, L3711, L3712	.015"	807 / R807*	1/2"
VRG Series Engines
VRG220, VRG330	.020"	42XL / R42XL*	3/4"
VRG265, VRG283, VRG310	.020"	42XL / R42XL*	3/4"
VRG155, VRG232	.020"	847 / R847*	1/2"
VHP Series Engines
F2895G, F2895GSI	.015"	807 / R807*	1/2"
F3521G, F3521GSI	.015"	807 / R807*	1/2"
F3524 GSI	.015"	RB77C	.812"
L5108G, L5108GSI	.015"	807 / R807*	1/2"
L5790G, L5790GSI	.015"	807 / R807*	1/2"
L5794 GSI	.015"	RB77C	.812"
L7042G, L7042GSI	.015"	807 / R807*	1/2"
L7044 GSI	.015"	RB77C	.812"
P9390G, P9390GSI	.015"	807 / R807*	1/2"
VHP-GL (Pre-Chamber Engines)
F2895GL, F3521GL, L5108GL	.010"	R807**	1/2"
L5790GL, L7042GL, P9390GL	.010"	R807**	1/2"
All engines with 18mm - 13/16" reach heads	.012"	RB77C	.812"
VGF Series Engines
F18G, F18GL	.012"	RB77C	.812"
H24G, H24GL	.012"	RB77C	.812"
L36G, L36GL	.012"	RB77C	.812"
P48GL	.012"	RB77C	.812"
VSG Series Engines
F11G, F11GSI	.010"	R407XLC*	3/4"
AT Series Engines
AT25, AT27	.010"	R807**	1/2"
All engines with 18mm - 13/16" reach carriers	.012"	RB77C	.812"
Obsolete Engines
180GKB, 190GLB, 195GK	.020"	887 / R887	1/2"
180GL, 190GL, 195GL, 140GK	.020"	887 / R887	1/2"
140GZ, 185GL, 145GKB, WAK	.020"	887 / R887	1/2"
WAKB, WAKC, NK, NKR, LRO	.020"	887 / R887	1/2"
LRZ, VLRO, BA, BL, MB, BK	.020"	887 / R887	1/2"
CHK, CHS, CR, CSR, CU, DHK	.020"	887 / R887	1/2"
DK, DKR, DR, DU, BK, EL, FC	.020"	887 / R887	1/2"
FCL, FCS, FL, FLS, GAK	.020"	887 / R887	1/2"
130GS, 130GL, 140GZ, 180G	.020"	887 / R887	1/2"
MK, ML, MS, MZA, SRK, RBR	.020"	887 / R887	1/2"
F2894G, F2894GSI, F3520G	.015"	807 / R807	1/2"
L7040G, L5100G, L5788G	.015"	807 / R807	1/2"
H1077G, L1616G, P2154G	.020"	42XL / R42XL	3/4"

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WORTHINGTON

Engine Model	Plug Gap	STITT Part No.	Reach
UTC, SUTC, ML, MLV	.015"	107 / R107*	5/8"
SEH, SLHC, SLHCA, SLHP	.015"	107 / R107*	5/8"
SLDHG, SDHP	.015"	107 / R107*	5/8"
LTC, CG, CCG, DG, DDG	.015"	107 / R107*	5/8"
EEG, LFC, LCE, SDHG	.015"	107 / R107*	5/8"
Horizontal, All Models	.020"	731	.870"

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* See STITT Precious Metal Catalog PM-REC 0100-5M

** Call STITT Factory for Annular Gap Spark Plug Recommendations

*** Anti-Galling Surface Finish