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MSD's spark plugs are engineered to improve the efficiency of the combustion process to create the most power possible combined with increased durability. The center tip of the plug is made from iridium to promote the best spark and increase resilience. A proprietary ceramic material enhances the dielectric strength of the plug housing forcing the spark, even under extreme cylinder pressures, to jump across the plug gap to the ground electrode. This electrode is machined to expose more spark to the incoming gases to promote the most effective combustion event possible.
This Part Fits:
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 1964 | American Motors | American | 330 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1965 | American Motors | American | 330 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | American | 400 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1964 | American Motors | American | 440 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1960 | American Motors | American | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | American | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | American | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | American Motors | American | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | American | Panel Delivery | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | American Motors | American | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | American | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1960 | American Motors | American | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | American | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | Classic | 400 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1963 | American Motors | Classic | 660 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1964 | American Motors | Classic | 660 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1964 | American Motors | Classic | 660 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1965 | American Motors | Classic | 660 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1963 | American Motors | Classic | 770 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1964 | American Motors | Classic | 770 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1964 | American Motors | Classic | 770 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1965 | American Motors | Classic | 770 | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | Classic | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | Classic | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | Classic | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | Custom | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | Custom | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | Deluxe | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | Deluxe | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1965 | American Motors | Marlin | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1966 | American Motors | Marlin | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | Rambler | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1960 | American Motors | Rambler | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | Rambler | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1960 | American Motors | Rambler | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | Rebel | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1959 | American Motors | Rebel | Super | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1961 | American Motors | Super Six | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1962 | American Motors | Super Six | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1998 | Audi | A4 | Avant | |
| 2004 | Audi | A4 | Avant | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2004 | Audi | A4 | Avant | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2005 | Audi | A4 | Avant | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1996 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1997 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1997 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1998 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1998 | Audi | A4 | Base | |
| 1999 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1999 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2000 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2000 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2001 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2001 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2002 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2002 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2003 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2003 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2004 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2004 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2005 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2005 | Audi | A4 | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2003 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2003 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2004 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2004 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2005 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2005 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 2006 | Audi | A4 | Cabriolet | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Mercury | Custom | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1946 | Mercury | Mercury | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1947 | Mercury | Mercury | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1948 | Mercury | Mercury | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap;,Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1949 | Mercury | Mercury | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Mercury | Monterey | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Mercury | Monterey | Sun Valley | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Bonneville | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1955 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1956 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Catalina | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1949 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1949 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1955 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1956 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Chieftain | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Chieftain | Custom Safari | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Chieftain | Custom Safari Transcontinental | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1955 | Pontiac | Chieftain | Safari | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Chieftain | Safari | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Special | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1953 | Pontiac | Chieftain | Special | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Special | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Chieftain | Special | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Super Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Chieftain | Super Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Super Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Chieftain | Super Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1954 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1955 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1956 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Star Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1955 | Pontiac | Star Chief | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1956 | Pontiac | Star Chief | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Star Chief | Custom | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Star Chief | Custom Safari | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Star Chief | Super Deluxe | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Strato-Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1946 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1946 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1947 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1947 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1948 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1948 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1949 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1949 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1950 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1951 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1952 | Pontiac | Streamliner | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1957 | Pontiac | Super Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1958 | Pontiac | Super Chief | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1946 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1946 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1947 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1947 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1948 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
| 1948 | Pontiac | Torpedo | Base | Iridium Tip Spark Plug; Single; Plug Type 15IR4; [Available While Supplies Last];0.035 in. Plug Gap; |
Specifications:
| Brand | MSD |
| Category | Ignition |
| 9608 | Standard |
| 548 | Iridium |
| Emission Code | 2 |
| Heat Range | 4 |
| 551 | 13/16 |
| Length | Standard |
| Plug Style Code | 15IR4 |
| Product Type | Spark Plug |
| Projected Tip | No |
| Quantity | 1 |
| Reach | 0.375 |
| Resistor | Yes |
| 605 | Yes |
| Seat Type | Gasket |
| Style | Iridium |
| Thread Size | 14 |
| Warning | California Proposition 65 |
| Warranty | Manufacturer's Limited 1 Year Warranty |
| 1917 | No |
| Description_INV | OBS SPARK Spark Plug 15IR4, Single |
| Description_DES | Iridium Spark Plug |
| Description_EXT | CLEARANCE ITEM / ALL SALES FINAL - 14mm - .375 in Reach - Gasket Seat - Single Pack |
| Description_MKT | MSD's spark plugs are engineered to improve the efficiency of the combustion process to create the most power possible combined with increased durability. The center tip of the plug is made from iridium to promote the best spark and increase resilience. A proprietary ceramic material enhances the dielectric strength of the plug housing forcing the spark, even under extreme cylinder pressures, to jump across the plug gap to the ground electrode. This electrode is machined to expose more spark to the incoming gases to promote the most effective combustion event possible. |
| Description_FAB | Lower voltage Requirements for longer coil life |