Marine Parts & Accessories
Mercruiser Precision Parts keep your engines
in good, safe operating condition.
Insist on ONLY Mercruiser Factory Parts!
Mercruiser Engines use NGK Spark Plugs for Fast starts
and efficient operation.
Some Mercruiser Spark plugs may come in AC Delco Brand.
Always keep good plugs in your engine.
Did you know that a bad plug could cause arcing on a Thunderbolt coil?
We have customers who replace arcing coils when the only real problem
was a bad plug or plug wire.
Water getting into a cylinder from bad exhaust will also
allow the Thunderbolt coil to arc at the pole.
This is a very dangerous condition and any arcing must
diagnosed and repaired to prevent possible explosion!
Installing a non-resistor plug in some EFI Outboards will
result in a terrible running engine!
A spark plug can tell much about how an engine is running.
Inspect the electrodes of the old plugs. It could save you thousands!
Our Spark Plug Selection is HUGE.
Click HERE to order your plugs online after you have confirmed the right type.
Distributors, Ignition Coils Plug Wires, Plugs & Caps
| Model | Cyl | Ign | Year | SNS | Distributor | Coil | Plug Wires | Plugs | Cap | Cap Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 110 | 4 | Delco | 63-66 | 1537370-204403 | 195141 | 806529a1 | 816761a5 | 8134711 | 9459t | na |
| 120 | 4 | Delco | 64-74 | 1666601-3825578 | 195141 | 806529a1 | 816761a5 | 8134711 | 9459t | na |
| 120/2.5L | 4 | Delco | 74-89 | 3825579-0C853255 | 195141 | 806529a1 | 816761a5 | 59571 | 9459t | na |
| 140 | 4 | Delco | 68-74 | 2508261-3826282 | 195141 | 806529a1 | 816761a5 | 8134711 | 9459t | nas |
| 140/3.0L | 4 | Delco | 74-89 | 3826283-0C856558 | 195141 | 806529a1 | 816761a5 | 59571 | 9459t | na |
| 3.0L/LX | 4 | Prestolite | 90-95 | 0C856559-0F603999 | 816129a1 | 806529a1 | 816761a5 | 59571 | 810827t | na |
| 3.0L | 4 | Delco Digital | 90-95 | 0C856559-0F603999 | na | 15071t | 84-816761a13 | 59571 | na | na |
| 3.0LX | 4 | Delco Digital | 90-95 | 0C856559-0F603999 | na | 15071t | 816761a13 | 816336 | na | na |
| 3.0L/LX | 4 | EST | 90-98 | 0C856559 & up | 817377 | 817378 | 816761a14 | 816336 | 811635t | 811635t2 |
| 165/3.7L | 4 | Delco | 87-89 | 0B434940 & up | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 170 | 4 | Delco | 85-86 | 6916779-0B434940 | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 180/3.7LX | 4 | Delco | 87-89 | 0B436391 & up | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 180/3.7LX | 4 | Prestolite | 87-89 | 0B436391 & up | 19514a2 | 806529a1 | 816761a6 | 97389 | 810827t | na |
| 190 | 4 | Delco | 85-86 | 6916779-0B436390 | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 470 | 4 | Delco | 76-84 | 4208730-6916778 | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 485 | 4 | Delco | 80-82 | 5685394-6218036 | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| 488 | 4 | Delco | 83-84 | 6170297-6916778 | 19514a2 | 806529a1 | 816761a6 | 97389 | 9459t | na |
| All Replacement 4 cyl ign. | 4 | Delco | all | all | na | 806529a1 | na | na | 810827t | na |
| Model | Cyl | Ignition | Years | Serial Numbers | Distributor | Ign. Coil | Wire Set | Spark Plugs | Cap | Rotor-Cap Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 140 | L6 | Delco | 1963 | 1538930-1725960 | NLA | NLA | 84-816761a8 | 33-8134711 | 33765t | na |
| 150 | L6 | Delco | 1964-66 | 1666495-2048046 | NLA | NLA | 84-816761a8 | 33-8134711 | 33765t | na |
| 160 | L6 | Delco | 1967-69 | 2048022-2494926 | NLA | 392-806529a1 | 84-816761a8 | 33-8134711 | 33765t | na |
| 160 | L6 | Delco | 1969 | 2494927-2770031 | 811192 | 392-806529a1 | 84-816761a8 | 33-8134711 | 33765t | na |
| 165 | L6 | Delco | 1970 | 2770032-2771483 | 811192 | 392-806529a1 | 84-816761a8 | 33-8134711 | 33765t | na |
| 165 | L6 | Delco | 1971-81 | 2771484-5813433 | 811192 | 392-806529a1 | 84-816761a8 | 33-59571 | 33765t | na |
| 200 | L6 | Delco | 1969 | 2453769-2712072 | 811192 | 392-806529a1 | 84-816761a8 | 33-8134711 | 33765t | na |
| All Prestilite Replacement | L6 | ... | All | All | NLA | 392-806529a1 | n/a | n/a | 392-9086t | na |
| Model | Cyl | Ignition | Years | Serial Numbers | Distributor | Ign. Coil | Wire Set | Spark Plugs | Cap | Rotor-Cap Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 185 4bbl 3.8L | V6 | Prestolite | 1983-84 | 6330183-6919655 | na | 392-806529a1 | 84-816761a7 | 33-59571 | 392-9086t | na |
| 175 4.3L 2bbl | V6 | Thunderbolt IV | 1987-93 | 0B527955-0F000877 | 90747a28 | 392-805570a2 | 84-816761a16 | 33-59571 | 815407a2 | 815407t6 |
| 185 4.3L 2bbl | V6 | Thunderbolt IV | 1985-87 | 6919656-0B527954 | 90747a28 | 392-805570a2 | 84-816761a16 | 33-59571 | 815407a2 | 815407t6 |
| 205 4bbl 4.3LX | V6 | Thunderbolt IV | 1985-93 | 0A331455-0F001219 | 90747a28 | 392-805570a2 | 84-816761a16 | 33-59571 | 815407a2 | 815407t6 |
| 262 Mag tbi Gen+ | V6 | Delco | 1996 | 0F803800-0F999999 | 807964a1 | 817378 | 816608a82 | 33-816336 | 850484t | 850484t1 |
| 262 Mag tbi Gen+ | V6 | Delco | 1997 | 0K0015121-0K999999 | 807964a1 | 817378 | 816608a82 | 33-816336 | 850484t | 850484t1 |
| 4.3L 2bbl | V6 | Thunderbolt IV | 1993-96 | 0F000878-0F802999 | 805185a27 | 392-805570a2 | 84-816761a16 | 33-59571 | 815407a2 | 815407t6 |
| 4.3LX 4bbl | V6 | Thunderbolt IV | 1993-96 | 0F001220-0F802999 | 805185a27 | 392-805570a2 | 84-816761a16 | 33-59571 | 815407a2 | 815407t6 |
| 4.3LX/LXH Alpha Gen+ | V6 | Thunderbolt IV | 1996-97 | 0F803000-0K999999 | 805185a27 | 392-805570a2 | 84-816761a16 | 33-816336 | 815407a2 | 815407t6 |
| 4.3LX/LXH Bravo Gen+ | V6 | Thunderbolt IV | 1996-97 | 0F803000-0K999999 | 805185a27 | 392-805570a2 | 84-816761a16 | 33-816336 | 815407a2 | 815407t6 |
| 4.3L/LH Alpha Gen+ | V6 | Thunderbolt IV | 1998 & newer | 0L010044 & UP | 805185a27 | 392-805570a2 | 84-816761a16 | 33-816336 | 815407a2 | 815407t6 |
| 4.3L/LH Bravo Gen+ | V6 | Thunderbolt IV | 1998 & newer | 0L010044 & UP | 805185a27 | 392-805570a2 | 84-816761a16 | 33-816336 | 815407a2 | 815407t6 |
| 4.3L EFI Gen+ tbi | V6 | Delco | 1998 & newer | 0L012009 & UP | 807964a1 | 817378 | 84-816608a70 | 33-816336 | 850484t | 850484t1 |
| Model | Cyl | Ignition | Years | Serial Numbers | Distributor | Ign. Coil | Wire Set | Spark Plugs | Cap | Rotor/Cap Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 190 GM283 | V8 | Delco | 1963-64 | 1564539-1730903 | nla | 392-805570a2 | 84-816761a9 | nla | nla | na |
| 215 MCM & MIE FORD 302 | V8 | Autolite | 1970-72 | 2781153-3563181 | nla | 392-806529a1 | 84-816761a9 | nla | 393-4988t2 | na |
| 215 MCM & MIE FORD 302 | V8 | Mallory | 1970-72 | 2781153-3563181 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 391-5075t | na |
| 225 MCM & MIE FORD 302 | V8 | Autolite | 1973-74 | 3385721-4166999 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 393-4988t2 | na |
| 225 MCM & MIE FORD 302 | V8 | Mallory | 1973-74 | 3385721-4166999 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 391-5075t | na |
| 225 MCM & MIE FORD 302 | V8 | Mercury | 1973-74 | 3385721-4166999 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 393-4988t2 | na |
| Model | Cyl | Ignition | Year | Serial Numbers | Distributor | Ign Coil | Plug Wires | Spark Plugs | Cap | Rotor/Cap Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 888 (Ford 302) | V8 | Mercury | 71-77 | 3108723-4887829 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 393-4988t2 | na |
| 888 (Ford 302) | V8 | Prestolite | 71-77 | 3108723-4887829 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 392-6318t | na |
| 888 (Ford 302) | V8 | Mallory | 71-77 | 3108723-4887829 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 391-5075t | na |
| 888 (Ford 302) | V8 | Autolite | 71-77 | 3108723-4887829 | nla | 392-806529a1 | 84-816761a9 | 33-813425 | 393-4988t2 | na |
| 225 (GM 327) | V8 | Delco | 63-69 | 1539620-2694014 | nla | 392-806529a1 | 84-816761a9 | nla | nla | na |
| 228 MCM & MIE | V8 | Mallory | 77-82 | 4765100-6218461 | 17177a1 | 392-806529a1 | 84-816761a9 | 33-59571 | 391-5075t | na |
| 898/198 MCM & MIE | V8 | Mallory | 77-82 | 4762210-6218461 | 17177a1 | 392-806529a1 | 84-816761a9 | 33-59571 | 391-5075t | na |
| 898/198 (GM 305) | V8 | Thunderbolt IV | 83-84 | 6218462-6899057 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 200/5.0L (GM 305) | V8 | Thunderbolt IV | 85-86 | 6899058-0B525981 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| Model | Cyl | Ignition | Years | Serial Numbers | Distributor | Ign Coil | Plug Wires | Spark Plugs | Cap | Cap/Rotor Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 200/5.0L (GM 305) | V8 | Thunderbolt IV | 87-95 | 0B525982-0F600999 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 200/5.0L (GM 305) | V8 | Thunderbolt IV | 87-95 | 0B525982-0F600999 | 805185a26 | 392-805570a2 | 84-816761a17 | 33-59571 | 805759t2 | 805759t4 |
| 225 MIE (GM 327) | V8 | Thunderbolt | 68 | 2278647-2694014 | nla | 332-4895a8 | 84-816761a9 | 33-813415 | 393-4988t2 | 393-4988t1 |
| 228 | V8 | Thunderbolt IV | 87-95 | 6218462-6899268 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 230/5.0L MIE LH | V8 | Thunderbolt IV | 81-86 | 5907058-0B522505 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 230/5.0L MIE RH | V8 | Thunderbolt IV | 81-86 | 5907058-0B522505 | 90747a27 | 392-805570a2 | 84-816761a3 | 33-59571 | 805759t2 | 805759t4 |
| 230/5.0L MIE LH | V8 | Thunderbolt IV | 87 | 0B522506-0B788151 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 230/5.0L MIE RH | V8 | Thunderbolt IV | 87 | 0B522506-0B788151 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 230 5.0LX | V8 | Thunderbolt IV | 85-86 | 6899269-0B525981 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| Model | Cyl | Ignition | Years | Serial Numbers | Distributor | Ign Coil | Plug Wires | Spark Plugs | Cap | Cap/Rotor Kit |
|---|---|---|---|---|---|---|---|---|---|---|
| 230/5.0LX | V8 | Thunderbolt IV | 87-95 | 0B525982-0F600999 | 90747a27 | 392-805570a2 | 84-816761a4 | 33-59571 | 805759t2 | 805759t4 |
| 230/5.0LX | V8 | Thunderbolt IV | 87-95 | 0B525982-0F600999 | 805185a26 | 392-805570a2 | 84-816761a17 | 33-59571 | 805759t2 | 805759t4 |
| 5.0 Alpha Gen+ | V8 | Thunderbolt V | 98 and newer | 0L015751 & UP | 805185a26 | 392-805570a2 | 84-816761a17 | 33-816336 | 805759t2 | 805759t4 |
| 5.0 Bravo Gen + | V8 | Thunderbolt V | 98 and newer | 0L015751 & UP | 805185a26 | 392-805570a2 | 84-816761a17 | 33-816336 | 805759t2 | 805759t4 |
| 5.0L EFI Gen + | V8 | Delco | 98 | 0L012052-0L339999 | 805222a1 | 806673t | 84-816608a70 | 33-816336 | 808483t | 808483t2 |
| 5.0L EFI Gen + | V8 | Mercury | 99 and newer | 0L340000 & UP | 805185a26 | 392-805570a2 | 816608a83 | 33-816336 | 805759t2 | 805759t4 |
| 233 MCM & MIE | V8 | Mercury | 75-77 | 4173000-4902304 | nla | 392-806259a1 | 84-816761a9 | 33-813425 | 393-4988t2 | na |
| 233 MCM & MIE | V8 | Prestolite clip cap | 75-77 | 4173000-4902304 | nla | 392-806259a1 | 84-816761a9 | 33-813425 | 392-6318t | na |
| 233 MCM & MIE | V8 | Prestolite screw cap | 75-77 | 4173000-4902304 | nla | 392-806259a1 | 84-816761a9 | 33-813425 | 392-9766t | na |