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What is rod length of 409 Chevy?

The 409 Chevy engine's rod length depends on the specific year and application. There wasn't a single rod length used across all 409s. You'll need to specify the year and potentially the application (e.g., passenger car, truck, etc.) to get a precise answer. However, the most common rod length for a 409 is 6.385 inches. But again, verify this with a parts catalog or engine specs for your specific 409.