No, The stroke is the same for the 3.5 and 3.7L at 86.7mm. Ford got to 3.7L with a larger bore. 92.5mm for the 3.5L and 95.5mm for the 3.7L. The cylinders were burning up "supposedly" in EcoBoost form due to the thinner wall . It could not hold up to Ford's testing requirements. The rods didnt pose such a problem AFAIK.
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