40 Years Of 348 And 409 W-Engines - W-ow!
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The 1962-63 Z11 heads outwardly look like 409 heads, but their intake ports are rectangular and bigger. They measure 1 3/8 x 2 1/4 inches. By comparison, the '63 427 Mystery Motor ports are even larger: 1 1/2 x 2 7/16 inches. View Related Article
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