13 Ignition parts are listed for the 1978 Excalibur Phaeton, in 2 part types, covering the 7.4L 454cid V8 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The ignition system on the 1978 Excalibur Phaeton delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. All 13 listed parts are Spark Plug (11 parts) and Distributor Mounting Gasket (2 parts).
The 1978 Excalibur Phaeton came with a single engine, the 7.4L 454cid V8, and every part is verified against it.
7 brands supply ignition parts for the 1978 Excalibur Phaeton, led by CHAMPION (3 parts), NGK (3 parts) and ACDELCO (2 parts), plus 4 more brands. Quality grades include Copper / Nickel, Platinum and Iridium.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1978 Excalibur Phaeton. 3 parts have it, including CHAMPION 18 (Spark Plug) and ACDELCO 2 (Spark Plug). Each part number opens a page with every vehicle that part fits.
Distributor Mounting Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | 70194 | 🇺🇸 US | Thickness: 0.053 In | View on Amazon |
| VICTOR REINZ | 711350200 | 🇺🇸 US | Inside Diameter: 1.280 In | View on Amazon |
This table covers the gaskets that seal the Distributor Mounting. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
2 Distributor Mounting Gasket parts are listed for the 1978 Excalibur Phaeton, from FEL-PRO and VICTOR REINZ.
This group includes FEL-PRO 70194 and VICTOR REINZ 711350200.
Spark Plug
Summary: Notes include pre-set gaps of 0.035", 0.040", 0.045" and 0.060". Replacement brands in this table include CHAMPION, NGK and ACDELCO.
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMPION Popular | 18 | 🇺🇸 US | Copper PlusPre-Set Gap: 0.045" | View on Amazon |
| ACDELCO | CR45TS | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentConventional | View on Amazon |
| MOTORCRAFT | SP425 | 🇺🇸 US | Copper | View on Amazon |
| MOTORCRAFT | SP425X | 🇺🇸 US | NickelSpark Plug Approximate Resistor Value: 2,000 | View on Amazon |
| NGK | 6945 | 🇺🇸 US | V-PowerPre-Set Gap: 0.060" | View on Amazon |
Double Platinum (lasts up to 3x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMPION | 7018 | 🇺🇸 US | Double Platinum PowerPre-Set Gap: 0.04" | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK | 7559 | 🇺🇸 US | Iridium IXPre-Set Gap: 0.060" | View on Amazon |
| SKP | SP1010 | 🇺🇸 US | Tapered Ground Electrode with Platinum Chip | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | 2 | 🇺🇸 US 🇨🇦 CA | GoldRapidfire | View on Amazon |
| CHAMPION Popular | 3018 | 🇺🇸 US | Platinum PowerPre-Set Gap: 0.04" | View on Amazon |
| NGK | 3207 | 🇺🇸 US | G-PowerPre-Set Gap: 0.060" | 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.
11 Spark Plug parts are listed for the 1978 Excalibur Phaeton, from CHAMPION, NGK, ACDELCO and 2 other brands. CHAMPION 18 carries the "Popular" badge.
In the Copper / Nickel grade, MOTORCRAFT, CHAMPION, ACDELCO and 1 other brand supply 5 parts: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is CHAMPION 18.
In the Double Platinum (lasts up to 3x longer than Copper / Nickel) grade, CHAMPION supplies 1 part: 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. A representative part number is CHAMPION 7018.
The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 2 options from NGK and SKP — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. NGK 7559 is listed in this group.
In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, ACDELCO, CHAMPION and NGK supply 3 parts: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 2.
Buying Ignition Parts for a 1978 Excalibur Phaeton
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Confirm you have the 7.4L 454cid V8 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 Distributor Mounting Gasket .
Frequently Asked Questions
How many ignition parts fit the 1978 Excalibur Phaeton?
Our catalog currently lists 13 ignition parts for the 1978 Excalibur Phaeton across 2 subcategories and 7 brands, covering the 7.4L 454cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 1978 Excalibur Phaeton?
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 1978 Excalibur Phaeton?
Notes on this page include pre-set gaps of 0.035", 0.040", 0.045" and 0.060". 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 1978 Excalibur Phaeton 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 1978 Excalibur Phaeton?
Every part on this page is matched to the 7.4L 454cid V8 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 1978 Excalibur Phaeton
Ignition Parts for Other Excalibur Phaeton Years
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