The Sierra 18-5273 Tune Up Kit fits GM V-8 Engines with Thunderbolt IV and V HEI ignitions. It is interchangeable with the following: GLM 71780, Mallory 9-29350, Mercury 805759T3, 805759Q3. Contains 18-5431 Rotor Assembly, 18-5395 Distributor Cap. Each component meets or exceeds the original part it replaces. Fit specific, check part numbers before purchase to ensure proper fit.
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