MERCRUISER
Ignition System
Spark
Contact
Dist.
Tune-Up
Electronic
Plug
Model
CYL
Year
Serial #
Set
Condenser
Rotor
Cap
Coil
Kit
Distributor
Conv. Kit
Wires
(377CID)
MX 6.2L MPI SKI
V8
2002-2004 OM317000 & Up
N/A
N/A
NA
NA
N/A
18-8828-1
➓
(377CID)
325 MCM & MIE
V8
1969-1974
2278747 & up
N/A
N/A
N/A
18-5494-1 ➌✜ N/A
18-8803-2
➅
(427cid)
18-5498-1 ➍✜
330 MCM & MIE
V8
1977-81
4623115-6083144 ➀
18-5494-1 ➌ 18-5296-2
18-8803-2
(454cid)
18-5498-1 ➍
330 MCM & MIE
V8
1977-81
4623115-6083144 ➅
N/A
N/A
18-5494-1 ➌✜ N/A
18-8803-2
(454cid)
18-5498-1 ➍✜
330, 340, 7.4L
V8
1981-92
5889914-0D715493 ➉
N/A
18-5494-1 ➌✜ N/A
18-8804-1
MCM & MIE(454cid)
18-5498-1 ➍✜
350 MIE(454cid)
V8
1974-76
3780450-4623109 ➅
N/A
N/A
18-5494-1 ➌✜ N/A
18-8803-2
18-5498-1 ➍✜
370, 400, 440TRS
V8
1978-85
4179554-6721527 ➀
18-5494-1 ➌ 18-5296-2
18-8803-2
(454cid)
18-5498-1 ➍
370, 400, 440 TRS
V8
1978-85
4883520-6721527 ➄
18-5494-1 ➌✜ N/A
18-8803-2
(454cid)
18-5498-1 ➍✜
370 TRS(454cid)
V8
1985-87
6721528-0B714586 ➉
N/A
18-5494-1 ➌✜ N/A
18-8804-1
18-5498-1 ➍✜
420, 425(454cid)
V8
1987-93
0A398941-0D937011 ➉
N/A
18-5494-1 ➌✜ N/A
18-8837-1
18-5498-1 ➍✜
450(454cid)
V8
1995-96
0F347100-0F347277 ➉
N/A
18-5494-1 ➌✜ N/A
18-8804-1
18-5498-1 ➍✜
454 MAG
V8
1986-97
0A631894-OK999999 ➉✱✭❂ N/A
18-5494-1 ➌✜ N/A
18-8804-1
ALPHA/ BRAVO
18-5498-1 ➍✜
454-EFI,MAG MPI
V8
1994-2001
0F115700 & up
N/A
18-5494-1 ➌✜ N/A
18-8832-1
➏
& HORIZON MIE
18-5498-1 ➍✜
454 MAG MPI
V8
1998
0L002200-0L086000 ➏
N/A
18-5494-1 ➌✜ N/A
N/A
HORIZON MIE
18-5498-1 ➍✜
454 MAG MPI
V8
1999-2001
OL086001-OL674000 ➏
N/A
18-5494-1 ➍✜ N/A
18-8832-1
HORIZON MIE
18-5498-1 ➍✜
390GM(482cid)
V8
1969-70
2781129-2825059 ➅
N/A
N/A
N/A
N/A
18-8803-2
460GM TRS
V8
1983-86
6180970-6181046 ➀
18-5494-1 ➌ 18-5296-2
18-8803-2
18-5498-1 ➍
460GM TRS
V8
1983-86
6180970-6181046 ➄
18-5494-1 ➌✜ N/A
18-8803-2
18-5498-1 ➍✜
465
V8
1992-94
OD763732-OF213244
N/A
N/A
N/A
18-8837-1
496 / 8.1L
V8
2000 & Up
OM025000 & up
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
18-8838-1
➙
500
V8
1994-98
OF213293-OL001772
N/A
N/A
N/A
18-8837-1
500(Gen+)
V8
1999
OL414639-OL601036 ➉
N/A
N/A
N/A
18-8837-1
(502cid)
500GM EFI
V8
1998-2000
0L001477 & up
N/A
N/A
N/A
N/A
➏
(502cid)
502GM EFI &
V8
1993-98
0D840650-0L085000 ➏
N/A
N/A
N/A
18-8832-1
MAG MPI(502cid)
502GM MAG
V8
1990-93
0C878221-OF114528 ✱✭
N/A
N/A
N/A
18-8804-1
(502cid)
502GM MAG
V8
1998-2001
0L085001 & up
N/A
N/A
N/A
18-8832-1
➋
(502cid)
8.2L GM MPI MIE
V8
1996-2001
0F819620 & up
N/A
N/A
N/A
18-8832-1
➏
(502cid)
8.2L GM MPI MIE
V8
1990-96
0C878221-0F819619 ✱✭❂
N/A
N/A
N/A
18-8804-1
(502cid)
525GM SC(502cid)
V8
1991-95
0D456000-0F877734 ➉
N/A
N/A
N/A
18-8804-1
525GM SC(502cid)
V8
1996-99
0K000012 & up
N/A
N/A
N/A
18-8837-1
➉
575GM SCI(502cid)
V8
2000-2005
0L306696 & up
N/A
N/A
N/A
N/A
➏
600GM SC(502cid)
V8
1991-93
OD456489-0D763875
N/A
N/A
N/A
18-8837-1
➉
600GM SC(502cid)
V8
1993-2001
0D763876 & up
N/A
N/A
N/A
18-8837-1
➉
500GM BULLDOG,
V8
1990-2000
0C577003 -OM050281up ➉
N/A
N/A
N/A
18-8837-1
575GM(540cid)
800GM SC
V8
1993-2007
0D763836 & up
N/A
N/A
N/A
18-8837-1
➉
(572cid)
excl. Thunderbolt ign.
NA
For wire type lead use
➙ Distributorless Ignition
Not applicable
➆
➍ Mercury Ign.
* These coils are the old standard series, not the
NLA No longer available
With screw-down cap
➇
➎ Contact controlled dist. (std. Rotation) excl. Thunderbolt ign.
With conventional ign.
current upgrade kit
Mallory Ignition
➈
➀
➏ Delco EST system
Thunderbolt IV
✱ Thunderbolt IV(1) System
Prestolite
➉
➁
➐ Delco digital system
With copper connector
❂ Thunderbolt V Ignition
Autolite Ignition
➊
➂
➑ With dist. cap
Delco
✭ Thunderbolt IV(2) System
Mercury Ignition
➋
➃
➒ Distributor mounted ignition amplifier
Electronic dist. (std. Rotation)
✜ When replacing an HEI System with an Electronic
➄ Holley
➌
➓ Mercury HEI
➅ Thunderbolt
Distributor- the amplifier must be removed; the coil changed; and the plug wires may need to be changed out
596
