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305s had 1.72" intakes with 1.50" exhaust valves. Depending on the 350, it could be the same, or have either 1.94" intake and 1.50" exhaust, or 2.02" intake with 1.60" exhaust.

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15y ago
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Q: What are the valve size differences between a 305 and a 350 Chevy?
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