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This study focuses on the realizations of /y/ in Cor-yV sequences in English. The onglide /y/ after coronals in syllable onset is variably realized depending on its position within a word, the presence of stress on the vowel, and the manner of articulation of coronals. Since the pronunciation of /y/ is influenced by several factors and the application of such factors is not identical between dialects (NE and BE), each important factor for the realization of /y/ in Cor-yV sequences should be reflected in an analysis. Unlike previous rule-based analyses, it is argued in this paper that non-occurrence of /y/ in word-initial and non-initial stressed onset positions is attributed to the implementation of positional faithfulness. In such privileged positions, an onset consonant strongly maintains its features by not allowing co-articulation with the following [y]. In non-privileged positions such as non-word initial unstressed syllables, it is difficult for an onset coronal to preserve its features and it is subject to change its features by being co-articulated with the following [y]. This positional faithfulness does not seem to apply to BE except for the coronal fricative /s/ in word-initial position. This dialectal variation between NE and BE is accounted for by changing some of the relevant constraints used for NE.