Marine Engine (Inboard)

MERCRUISER INBOARD

350 Mag. Ski 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1991-97 T20R-U 0.9

350 Mag. EFI Ski 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1994-96 T20EPR-U 1.1

350 Mag. EFI Ski Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1996-97 T20EPR-U 1.1

350 Mag. MPI Ski 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1995-96 T20R-U 0.9
MIE General Motors V8, 350 & 454 CID 2001-04 IT20 1.5

350 Mag. MPI Ski Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1998-01 T20EPR-U 1.1

350 Mag.Black Scorpion Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1996-01 T20EPR-U 1.1

Scorpion Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 2003-04 IT20 1.5

377 Scorpian 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1997-98 T20EPR-U 1.1

MX 6.2L Black Scorpion Ski 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 2001-01 T20EPR-U 1.1

MX 6.2 Black Scorpion Ski 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 2003-04 IT20 1.5

5.7L 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1985-97 T20R-U 0.9
MIE General Motors V8, 305, 327, 350 CID 1988-97 T20R-U 0.9

5.7L Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1998-01 T20EPR-U 1.1
MIE General Motors V8, 350 & 454 CID 2001-04 T16EPR-U 1.1

454 Mag. EFI 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1995-97 T20R-U 0.9

454 Mag. MOI 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 350 & 454 CID 1996-97 T20R-U 1.0

470 224/L4

Model Year Standard Plug Gap (mm)
MIE Mercury Marine 4 Cyl., 224 CID 1976-84 T20R-U 0.9

215 with Mallory ignition 302/V8

Model Year Standard Plug Gap (mm)
MIE Ford V8 302, 351 CID 1970-72 MA20PR-U 0.7

225 (Ford ) 302/V8

Model Year Standard Plug Gap (mm)
MIE Ford V8 302, 351 CID 1973-74 MA20PR-U 0.7

233 (Ford) 351/V8

Model Year Standard Plug Gap (mm)
MIE Ford V8 302, 351 CID 1975-77 MA20PR-U 0.7

255 (Ford) 351/V8

Model Year Standard Plug Gap (mm)
MIE Ford V8 302, 351 CID 1973-80 MA20PR-U 0.7

198 305/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1977-77 T20R-U 0.9

228 305/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1977-80 T20R-U 0.9

230 305/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1981-87 T20R-U 0.9

5.0L 305/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1988-88 T20R-U 0.9

225 GM 327/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1968-68 W24S-U 0.0

250 327/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1968-69 W24S-U 0.0

255 GM 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1975-76 T20R-U 1.1

260 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1981-87 T20R-U 1.5

270 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1969-72 W24S-U 1.1

350 Mag. MPI Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1998-01 T20EPR-U 1.1

350 Mag. MPI 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 2001-04 IT20 1.5

350 Mag.Horizon 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1999-01 IT16 1.1
MIE General Motors V8, 305, 327, 350 CID 2001-04 IT20 1.5

5.7L Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1998-01 T20EPR-U 1.1
MIE General Motors V8, 305, 327, 350 CID 2001-04 T16EPR-U 1.1

5.7L EFI Gen+ 350/V8

Model Year Standard Plug Gap (mm)
MIE General Motors V8, 305, 327, 350 CID 1997-97 T20EPR-U 1.1

325 427/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1969-74 ITF24 0.9

330 with Mallory ignition 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1977-81 T20R-U 0.9

330 with Thunderbolt ignition 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1977-81 ITF24 0.9

340 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1981-87 T20R-U 0.9

350 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1974-76 ITF24 0.9

454 Mag.MPI Horizon 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1998-01 ITF20 1.0

MX 6.2L MPI (OL680003 - OM299999) 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2000-01 T16EPR-U 1.1

MX 6.2L MPI (OM300000 & Above) 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2001-03 IT20 1.5
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2001-04 IT20 1.5
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2001-04 IT20 1.5

MX 6.2L MPI Horizon (OM300000 & Above) 377/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2001-04 IT20 1.5

7.4L MPI 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1995-97 T20R-U 0.9

7.4L MPI (L29) 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1998-01 T20EPR-U 1.1

7.4L 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1981-97 T20R-U 0.9

7.4L EFI 454/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1996-97 T20R-U 0.9

8.1S MPI 496/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 2001-04 IT20 1.5

8.2L 502/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1990-96 T20R-U 0.9

8.2L MPI 502/V8

Model Year Standard Plug Gap (mm)
MIE General Motors 8-cyl., 427,454,482,496,502 CID 1996-01 T20R-U 1.0

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