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No. 305's have small valves due to the 305's small bore. Large valve heads can't be used on the 305 because the valves will hit the cylinder block. 350 heads breathe MUCH better than 305 heads. Stick with the 350 heads.

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10y ago
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Q: Will 305 heads make more horsepower on a 350 1990ish motor with carb conversion?
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