This study argues that resyllabification in English only takes place when the vowel preceding the intervocalic consonant is a stressed lax vowel by conducting a production experiment with 6 English native speakers. The experiment analyzed duration of the vowels before voiced and voiceless stops in English. The data consisted of monosyllabic and bisyllabic nonce words in English. The results revealed that the vowels were longer before voiced stops than before voiceless stops in monosyllabic words(CVC). As for bisyllabic words(CVCVC), however, the lax vowels [?] and [?] were significantly longer before voiced consonants only when they got stressed. In contrast, the diphthong [??] and the tense vowel [i] were not longer before voiced consonants regardless of their stresshood. These results suggest that resyllabification in CVCVC occurs only when the first syllable contains a stressed lax vowel in English. These results will be discussed in light of the syllable structure in English against a superheavy syllable.