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Review on Autolite XP3923 4PK Iridium Spark Plug by Michael Finnegan
Replacing a standard spark plug makes a world of difference
Used in high performance Cadillac 511cc engines. 1972 Cadillac Eldorado Convertible with 240,000 miles. The car runs like a scared rabbit and he really likes those candles. Increased mileage and performance.
Pros
- 0.6mm thin platinum alloy wire center electrode with improved flammability
Cons
- Upgradeable
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