AJAX (Cooper Energy Services)

Engine Model	Plug Gap	STITT Part No.
C30, C40, C42, CMA, E-15	0.025	S-R107*
EA15, E30, EA30, E42	0.025	S-R107*
DP60, DPC60, DP80	0.025	S-R107*
DPC80, DPC105, DP115	0.025	S-R107*
DP125, DPC140, DP160	0.025	S-R107*
DPC160, DPC162, DP165	0.025	S-R107*
DPC180, DPC230, DPC280	0.025	S-R107*
DP300, DPC300, DP325	0.025	S-R107*
DPC360, DPC540	0.025	S-R107*
DPC600, DPC800	0.025	S-R107*
Pre-combustion chamber modifications	0.015	S-R107*

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ARIEL

Engine Model	Plug Gap	STITT Part No.
162JGS/1, 325JGS/1	0.015	S-R407XLBEX8.4*

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ARROW

Engine Model	Plug Gap	STITT Part No.
C-46, C-66, C96, C106, C245, C255	0.025	S-8MEX
L-795, L-1770, L-2165	0.025	S-E78

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CATERPILLAR

Engine Model	Plug Gap	STITT Part No.
G-333, G-3304, G-3306
1/2" REACH CYL. HEADS	0.015	S-R407LBEX8.4*
3/4" REACH CYL. HEADS	0.015	S-R407XLBEX8.4*
G-343	0.015	S-R407XLBEX8.4*
G-342, G-353, G-379	0.015	S-R407LBEX8.4*
G-397, G-398, G-399	0.015	S-R407LBEX8.4*
3400 SERIES	0.015	S-R407XLBEX12*
3500 SERIES		Consult STITT Factory
3600 SERIES		Consult STITT Factory

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CLARK (Dresser Clark)

Engine Model	Plug Gap	STITT Part No.
RA, RAS, HRA, HRAT	0.015	S-R107*
MA, HMA	0.015	S-R107BEX8*
BA, HBA, HBAT, TLA, TCV	0.015	S-R107BEX12*
HLA, HLAT, TMB, TRA	0.015	S-R107BEX10*
Pre-combustion chamber modifications		Consult STITT Factory

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COOPER-BESSEMER

Engine Model	Plug Gap	STITT Part No.
GMV, GMVA, GMVC, GMVE, GMVH GMW, GMWA, GMCA, GMWH, GMX GMXD, GMXE, GMXH, V50, V75 W-330, Z-330, QUAD
Short Reach (5/8")	0.015	S-R107*
Long Reach (7/8")	0.015	S-R717*
LS, LSV 7/8"-18 Heads	0.015	S-R107BEX12.5*
LS, LSV 1-1/8"-12 Heads	0.015	S-R912BEX15
JS	0.015	S-R107BEX10*
Jet Cell® Pre-Combustion Chambers	0.010	S-R717**

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CUMMINS

Engine Model	Plug Gap	STITT Part No.
GNHC-4, GNH20 3/8" Reach	0.020	S-R40
GNH50, GV-12450 3/8" Reach	0.020	S-R40
GM-12-525 3/8" Reach	0.020	S-R40
GNHC-4, GNH20 1/2" Reach	0.020	S-R407L*
GNH50, GV-12450 1/2" Reach	0.020	S-R407L*
GM-12-525 1/2" Reach	0.020	S-R407L*
L10	0.015	S-R407XLBEX10*
"B" Series	0.015	S-R407XL*

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CUMMINS NATURAL GAS ENGINES

Engine Model	Plug Gap	STITT Part No.
G-495, G-743, G-855	0.020	S-R407XLBEX13*
G-1710, GTA-743, GTA-855	0.020	S-R407XLBEX13*
GTA-1710	0.020	S-R407XLBEX13*

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DEERE POWER SYSTEMS

Engine Model	Plug Gap	STITT Part No.
6076AFN	0.015	S-R407XL*

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DELAVAL (Transamerica)

Engine Model	Plug Gap	STITT Part No.
HV-8, HVA-8, HV-12, HVA-12	0.015	S-R717BEX18*
HV-16, HVA-16, HVA0, HA-6	0.015	S-R717BEX18*

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DETROIT DIESEL

Engine Model	Plug Gap	STITT Part No.
S-30G	0.020	S-R407XL*
S-50G, S-60G	0.020	S-R407XLBEX10*

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DRESSER-RAND

Engine Model	Plug Gap	STITT Part No.
KVGR	0.015	S-R107*
KVSR, KVSE, KVR	0.015	S-E72
TCVD, TLAD	0.015	S-R107BEX12*
Pre-chamber modifications		Consult STITT Factory

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ENTERPRISE (Also see DeLaval)

Engine Model	Plug Gap	STITT Part No.
All engines with 18mm 13/16" Reach
Cylinder Heads	0.015	S-CRL807LLBEX20*

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FAIRBANKS-MORSE (Coltec)

Engine Model	Plug Gap	STITT Part No.
OP38 Series		Consult STITT Factory

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FORD INDUSTRIAL POWER UNITS

Engine Model	Plug Gap	STITT Part No.
VSG 411 (1.1 Liter/67 C.I.D.)	0.015	S-R407XL*
VSG 413 (1.3 Liter/79 C.I.D.)	0.015	S-R407XL*
LSG 423 (2.3 Liter/140 C.I.D.)	0.015	S-RF407XL*
CSG 649 (4.9 Liter/300 C.I.D.)	0.015	S-RF840*
CSG 850 (5.0 Liter/302 C.I.D.)	0.015	S-R407XL*
WSG 858 (5.8 Liter/351 C.I.D.)	0.015	S-R407XL*
LSG 875 (7.5 Liter/460 C.I.D.)	0.015	S-R407XL*

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GEMINI

Engine Model	Plug Gap	STITT Part No.
G26, G35	0.020	S-R407L*

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GENERAL MOTORS POWERTRAIN

Engine Model	Plug Gap	STITT Part No.
2.2L (133 C.I.D.)	0.015	S-RF407XL*
4.3L (262 C.I.D.)	0.015	S-RF407L*
5.0L (305 C.I.D.)	0.015	S-RF407L*
5.7L (350 C.I.D.)	0.015	S-RF407L*
7.4L (454 C.I.D.)	0.015	S-RF407L*

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HERCULES

Engine Model	Plug Gap	STITT Part No.
G-1600	0.020	S-R407*
G2300, G3400	0.020	S-R407*
G4800	0.020	S-R407XLBEX8.4*

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INGERSOLL-RAND

Engine Model	Plug Gap	STITT Part No.
JVG, KVG, KVGR, KVT, PJVG, PKV	0.015	S-R107*
PKVGR, PKVT, PSVG, PVG, SVG	0.015	S-R107*
KVR, KVS, KVSR, KVSRA	0.015	S-E72
PKVR, PKVSR	0.015	S-E72
7/8"-18 Heads 7/8" Reach	0.015	S-R717*
7/8"-18 Heads 1" Reach	0.015	S-R707*

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KUBOTA

Engine Model	Plug Gap	STITT Part No.
KNG1600E, KNG3200E	0.015	S-407XL*

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LISTER PETTER

Engine Model	Plug Gap	STITT Part No.
HR2G, HR3G	0.015	S-R807*

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LORAIN

Engine Model	Plug Gap	STITT Part No.
30, 37, 40, 50	0.020	S-R807
A, L, O, R 7/8"-18 Heads	0.015	S-R707

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LUFKIN

Engine Model	Plug Gap	STITT Part No.
GSC	0.020	S-E78
GSD, GSDH, HC333, HT333	0.020	S-E78
H795	0.015	S-E78
H1770, H2165	0.015	S-E78

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M.E.P. INDUSTRIES

Engine Model	Plug Gap	STITT Part No.
M.E.P. 6, 8, 10, 12		Consult STITT Factory

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MINNEAPOLIS-MOLINE

Engine Model	Plug Gap	STITT Part No.
HD-336-4A, HE-425-6A	0.015	S-R807
HD-504-6A, HD605-6A	0.015	S-R807
HD-800-6A, HDT-800-60A	0.015	S-R807
HD-1210, HD-1600	0.015	S-R807
All with 7/8"-18 Heads	0.020	S-R107
All with 14mm Heads	0.020	S-R407

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NORDBERG (Hatch & Kirk)

Engine Model	Plug Gap	STITT Part No.
FSE96	0.015	S-CR807LLBEX24*

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OILWELL

Engine Model	Plug Gap	STITT Part No.
All 18mm Heads	0.020	S-R807

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SUPERIOR (Cooper Energy Services)

Engine Model	Plug Gap	STITT Part No.
6G510, 6G825, 8G825	0.020	S-R807*
12G825, 16G825	0.020	S-R807*
6GT510, 6GTL, 80G6, 80GX6	0.020	S-R807*
6GX825, 6GT825, 8GT825	0.020	S-R807*
8GTL, 80G8, 80GX8, 8GX825	0.020	S-R807*
12GT825, 12SGT, 12GTL	0.020	S-R807*
16SGT, 16GTL, 16GT825	0.020	S-R807*
All GTLA-GTLB Models (Pre-chamber)	0.020	S-CR807NPÝ
All 7/8"-18 Heads	0.020	S-R107*

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WAUKESHA

Engine Model	Plug Gap	STITT Part No.
F1197	0.020	S-82
F817G (14mm Heads)	0.020	S-R487*
F817G (18mm Heads)	0.020	S-R847*
F1905, H2476	0.015	S-R807*
H2475, L3711, L3712	0.015	S-R807*
VRG Series Engines
VRG220, VRG330	0.020	S-R407XL*
VRG265, VRG283, VRG310	0.020	S-R407XL*
VRG155, VRG232	0.020	S-R807*
VHP Series Engines
F2895G, F2895GSI	0.015	S-R807BEX13*
F3521G, F3521GSI	0.015	S-R807BEX13*
L5108G, L5108GSI	0.015	S-R807BEX13*
L5790G, L5790GSI	0.015	S-R807BEX13*
L7042G, L7042GSI	0.015	S-R807BEX13*
P9390G, P9390GSI	0.015	S-R807BEX13*
VHP-GL (Pre-Chamber Engines)
F2895GL, F3521GL, L5108GL	0.010	S-R807BEX13**
L5790GL, L7042GL, P9390GL	0.010	S-R807BEX13**
VGF Series Engines
F18G, F18GL	0.010	S-R807LLBEX13**
H24G, H24GL	0.010	S-R807LLBEX13**
L36G, L36GL	0.010	S-R807LLBEX13**
P48GL	0.010	S-R807LLBEX13**
VSG Series Engines
F11G, F11GSI	0.010	S-R407XLBEX8.4*
AT Series Engines
AT25, AT27	0.010	S-R807BEX20**
180GKB, 190GLB, 195GK	0.020	S-R887
180GL, 190GL, 195GL, 140GK	0.020	S-R887
140GZ, 185GL, 145GKB, WAK	0.020	S-R887
WAKB, WAKC, NK, NKR, LRO	0.020	S-R887
LRZ, VLRO, BA, BL, MB, BK	0.020	S-R887
CHK, CHS, CR, CSR, CU, DHK	0.020	S-R887
DK, DKR, DR, DU, BK, EL, FC	0.020	S-R887
FCL, FCS, FL, FLS, GAK	0.020	S-R887
130GS, 130GL, 140GZ, 180G	0.020	S-R887
MK, ML, MS, MZA, SRK, RBR	0.020	S-R887
F2894G, F2894GSI, F3520G	0.015	S-R807*
L7040G, L5100G, L5788G	0.015	S-R807*
H1077G, L1616G, P2154G	0.020	S-R40XL

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WORTHINGTON

Engine Model	Plug Gap	STITT Part No.
UTC, SUTC, ML, MLV	0.015	S-R107BEX24*
SEH, SLHC, SLHCA, SLHP	0.015	S-R107BEX24*
SLDHG, SDHP	0.015	S-R107BEX24*
LTC, CG, CCG, DG, DDG	0.015	S-R107*
EEG, LFC, LCE, SDHG	0.015	S-R107*
Horizontal, All Models		Consult STITT Factory

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* See STITT Precious Metal Catalog DPM293-2.5

** See STITT Annular Gap Catalog AG-895-5