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Phonological analyses of long-distance nasal harmony (LDNH) processes classify segments as triggers, undergoers, blockers, or transparent, based primarily on researchers’ subjective judgments of nasality. Using novel field instrumental data from Piaroa (a Jodï-Sáliban language with LDNH), we investigate stop duration, voice onset time (VOT), and nasal and oral airflow during the Piaroa voiceless stops in all-oral environments and continuous nasal harmony spans. We find that nasal harmony has no effect on stop duration and VOT, but voiceless stops in nasal contexts exhibit nasal airflow above an oral baseline at the onset of closure, suggesting that voiceless stops in nasal spans are partial undergoers of LDNH. This partial undergoer behavior is consistent with a model of coactivation of antagonistic gestural specifications for velum activity of the voiceless stop undergoer and the nasal harmony span. Similar voiceless obstruent pre-nasalization is likely widespread cross-linguistically but vastly underreported due to its subtle acoustic effects.