This page lists 16 ignition parts for the 1971 Citroen SM, across 2 part types, covering the 2.7L V6 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 1971 Citroen SM, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. All 16 listed parts are Spark Plug (15 parts) and Ignition Conversion Kit (1 part).
Every part on this page is matched to the 2.7L V6 — the only engine offered in the 1971 Citroen SM.
The most listed brands for 1971 Citroen SM ignition parts are NGK (5 parts), CHAMPION (5 parts) and ACDELCO (2 parts), plus 4 more brands. Quality grades include Copper / Nickel, Double Platinum and Iridium.
3 parts on this 1971 Citroen SM page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including NGK 4008 (Spark Plug) and NGK 6637 (Spark Plug). Click any part number to see every vehicle that part fits.
Ignition Conversion Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1A4144 | 🇺🇸 US 🇨🇦 CA | with Ducellier Distributor # 415512 Volt | View on Amazon |
This table covers the Ignition Conversion kits.
This group shows a single part: WELLS 1A4144.
Spark Plug
Summary: Notes include pre-set gaps of 0.024", 0.025", 0.028", 0.030", 0.032", 0.035", 0.036", 0.040" and 0.044". Replacement brands in this table include NGK, CHAMPION and ACDELCO.
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 4008 | 🇺🇸 US 🇨🇦 CA | StandardPre-Set Gap: 0.032" | View on Amazon |
| ACDELCO | R43XLS | 🇺🇸 US 🇨🇦 CA | ProfessionalConventional | View on Amazon |
| CHAMPION | 415 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.032" | View on Amazon |
| CHAMPION | 300 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.032" | View on Amazon |
| CHAMPION | 4151 | 🇺🇸 US 🇨🇦 CA | Copper PlusClassification: Champion Copper Plus Small Engine | View on Amazon |
| MOTORCRAFT | SP436AX | 🇺🇸 US 🇨🇦 CA | Copper | View on Amazon |
| NGK | 6427 | 🇺🇸 US 🇨🇦 CA | V-PowerPre-Set Gap: 0.032" | View on Amazon |
| NGK | 7131 | 🇺🇸 US 🇨🇦 CA | StandardPre-Set Gap: 0.036" | View on Amazon |
Double Platinum (lasts up to 3x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 41804 | 🇺🇸 US 🇨🇦 CA | ProfessionalDouble Platinum | View on Amazon |
| AUTOLITE | APP64 | 🇺🇸 US 🇨🇦 CA | Double PlatinumHex Size: 13/16 In | View on Amazon |
| CHAMPION | 7415 | 🇺🇸 US 🇨🇦 CA | Double Platinum PowerPre-Set Gap: 0.032" | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 6637 | 🇺🇸 US 🇨🇦 CA | Iridium IXPre-Set Gap: 0.032" | View on Amazon |
| CHAMPION | 9804 | 🇺🇸 US 🇨🇦 CA | IridiumPre-Set Gap: 0.03" | View on Amazon |
| SKP | SP1042 | 🇺🇸 US 🇨🇦 CA | Tapered Ground Electrode with Platinum Chip | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 7084 | 🇺🇸 US 🇨🇦 CA | G-PowerPre-Set Gap: 0.040" | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
15 Spark Plug parts for the 1971 Citroen SM come from 6 brands — NGK, CHAMPION, ACDELCO and 3 other brands. The "Popular" part is NGK 4008.
The Copper / Nickel section lists 8 options from NGK, CHAMPION, ACDELCO and 1 other brand — grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. NGK 4008 is listed in this group.
The Double Platinum (lasts up to 3x longer than Copper / Nickel) section lists 3 options from ACDELCO, AUTOLITE and CHAMPION — grouped under the catalog's "Double Platinum (lasts up to 3x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. ACDELCO 41804 is listed in this group.
In the Iridium (lasts up to 4x longer than Copper / Nickel) grade, NGK, CHAMPION and SKP supply 3 parts: grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is NGK 6637.
The Platinum (lasts up to 2x longer than Copper / Nickel) section lists 1 option from NGK — grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. NGK 7084 is listed in this group.
Buying Ignition Parts for a 1971 Citroen SM
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Confirm you have the 2.7L V6 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Spark Plug and Ignition Conversion Kit .
Frequently Asked Questions
How many ignition parts fit the 1971 Citroen SM?
Our catalog currently lists 16 ignition parts for the 1971 Citroen SM across 2 subcategories and 7 brands, covering the 2.7L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 1971 Citroen SM?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 1971 Citroen SM?
Notes on this page include pre-set gaps of 0.024", 0.025", 0.028", 0.030", 0.032", 0.035", 0.036", 0.040" and 0.044". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1971 Citroen SM was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1971 Citroen SM?
Every part on this page is matched to the 2.7L V6 engine. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1971 Citroen SM
Ignition Parts for Other Citroen SM Years
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