Marine Engine (Inboard)

CHEVROLET

194 cu.in.

Model Year Standard Plug Gap (mm)
1964-69 W16EPR-U 0.9

230 cu.in.

Model Year Standard Plug Gap (mm)
1962-69 W16EPR-U 0.9
1970 T20R-U 0.9

250 cu.in.

Model Year Standard Plug Gap (mm)
1962-69 W16EPR-U 0.9

250 cu.in

Model Year Standard Plug Gap (mm)
1970-78 T16PR-U 0.9

292 cu. in

Model Year Standard Plug Gap (mm)
1963-69 W20ESR-U 0.9

292 cu.in.

Model Year Standard Plug Gap (mm)
1970-90 T20R-U 0.9

283 cu.in.

Model Year Standard Plug Gap (mm)
1955-67 W16PR-U 0.9

302 cu.in.

Model Year Standard Plug Gap (mm)
1967-69 W16PR-U 0.9

307 cu.in.

Model Year Standard Plug Gap (mm)
1968-70 W16PR-U 0.9
1971-73 T20R-U 0.9

327 cu.in.

Model Year Standard Plug Gap (mm)
1961-69 W20SR-U 0.9

350 cu.in. (2 Bbl.)

Model Year Standard Plug Gap (mm)
1967-70 W16PR-U 0.9

350 cu.in. (4 Bbl.)

Model Year Standard Plug Gap (mm)
1970 W16PR-U 0.9

350 cu.in.

Model Year Standard Plug Gap (mm)
1971-90 T20R-U 0.9

400 cu.in.

Model Year Standard Plug Gap (mm)
1970 W16PR-U 0.9
1971-90 T20R-U 0.9

427 cu.in.

Model Year Standard Plug Gap (mm)
1971-72 T20P-U 0.9
1973-90 T20R-U 0.9

454 cu.in.

Model Year Standard Plug Gap (mm)
1979-90 T20R-U 0.9

A, B, BA, C, H, K, KB Regular Heads

Model Year Standard Plug Gap (mm)
W20S-U 0.7

A, B, BA, C, H, K, KB Alum. Heads

Model Year Standard Plug Gap (mm)
W16LS 0.7

KBL, KC, KFL, KL, KLC Regular Heads

Model Year Standard Plug Gap (mm)
W20S-U 0.7

KBL, KC, KFL, KL, KLC Alum. Heads

Model Year Standard Plug Gap (mm)
W16LS 0.7

LC, LD, M, MB, MBL Regular Heads

Model Year Standard Plug Gap (mm)
W20S-U 0.7

LC, LD, M, MB, MBL Alum. Heads

Model Year Standard Plug Gap (mm)
W16LS 0.7

MC, MCL, ML, W, WB Regular Heads

Model Year Standard Plug Gap (mm)
W20S-U 0.7

MC, MCL, ML, W, WB Alum. Heads

Model Year Standard Plug Gap (mm)
W16LS 0.7

153

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

181 Through S/N 603191

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

181 From S/N 603192

Model Year Standard Plug Gap (mm)
T20PR-U 0.9

225

Model Year Standard Plug Gap (mm)
W20P-U 0.9

283, 302, 307, 327 Gasket Heads

Model Year Standard Plug Gap (mm)
W20S-U 0.6

307, 350, 454 Tapered Seats

Model Year Standard Plug Gap (mm)
T20PR-U 0.6

350 Hi- Per,

Model Year Standard Plug Gap (mm)
T20R-U 0.9

427, 431 Series

Model Year Standard Plug Gap (mm)
MA20PR-U 0.8

430 Series

Model Year Standard Plug Gap (mm)
MA20P-U 0.8

4 Cyl. M91D, M91F

Model Year Standard Plug Gap (mm)
W20EP-U 0.9

4 Cyl. M122A, M122B

Model Year Standard Plug Gap (mm)
W22FS-U/TR22 0.9

6 Cyl. M46-3, M46-4, M46S-3

Model Year Standard Plug Gap (mm)
W20SR-U 0.9

6 Cyl. M47-3, M47-4, M47S-3

Model Year Standard Plug Gap (mm)
W20SR-U 0.9

6 Cyl. M170

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

6 Cyl. M183B

Model Year Standard Plug Gap (mm)
W22FS-U/TR22 0.9

6 Cyl. M225A, M225GD, MH225D

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

6 Cyl. M225D

Model Year Standard Plug Gap (mm)
1976 on T20PR-U 0.9
to 1975 W20ESR-U 0.9

6 Cyl. M265, M265A

Model Year Standard Plug Gap (mm)
W20SR-U 0.9

M426-Ski

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M426B

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M426D

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440B

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440BJ

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440BV

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440D

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440S

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M440SV

Model Year Standard Plug Gap (mm)
W16P-U 0.9

M460B

Model Year Standard Plug Gap (mm)
T20PR-U 0.9

V8 LM318A, LM318AC, LM318B

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 LM318BC, LM318BJ, LM318BT

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 LM318BV, LM318D

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 LM340B, LM340BJ, LM340BT

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 LM340BV

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 M44, M44-3

Model Year Standard Plug Gap (mm)
W20SR-U 0.9

V8 M45, M45-3, M45S, M45S-3

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

V8 M45SP-3

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

V8 M80

Model Year Standard Plug Gap (mm)
W20PR-U 0.9

V8 M81

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

V8 M273A, M273B, M273BT

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 M-360A

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 M318A, M318B, M318C, M318GD

Model Year Standard Plug Gap (mm)
W20PR-U 0.9

V8 M360B, M360BC, M360BJ

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 M360BT, M360BV

Model Year Standard Plug Gap (mm)
W20EPR-U 0.9

V8 M383B, M383BV

Model Year Standard Plug Gap (mm)
W20PR-U 0.9

V8 M400B, M400BV, M400S

Model Year Standard Plug Gap (mm)
W20PR-U 0.9

V8 M-413B, M413D

Model Year Standard Plug Gap (mm)
W20PR-U 0.9

V8 M413E

Model Year Standard Plug Gap (mm)
W20ESR-U 0.9

V8 M-426B, M-426D, M426SKI

Model Year Standard Plug Gap (mm)
W16P-U 0.9

V8 M-440B, M-440BJ, M-440BV

Model Year Standard Plug Gap (mm)
W16P-U 0.9

V8 M-440D,M-440S

Model Year Standard Plug Gap (mm)
W16P-U 0.9

V8 M460B

Model Year Standard Plug Gap (mm)
T16PR-U 0.9

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