In English, consonant voicing has large effects on the previous vowel duration, as does the status of the vowel as tense or lax. Our aim is to examine whether there is an interplay between L1 interference and L2 experience on L2 English vowel productions and perceptions. Korean L2 speakers were chosen as participants; Korean has no contrasts in tense versus lax vowels, and no coda consonant voicing contrast in a monosyllabic structure, but exhibits post-vocalic voicing contrasts in disyllabic structures, and in these cases, voiced consonants exhibit the lengthening of the preceding vowel. The participants were asked to read the list of English nonce words consisting of the English high and mid vowels and sets of plosives contrasting in voicing as a coda in the two different structures. In an ABX discrimination task, the subjects were asked to identify the different words from among minimal triples. None of the speakers exhibited different patterns in both structures in productions or perceptions. All speakers exhibited durational correlates to the voicing contrast, and to the tense-lax distinction. The effect of L2 English experience was not shown in perception task. Overall, there was no correlation between vowel length differences in production and perception scores.