https://partsnow.ai/news/gm-s-6-6l-duramax-is-gone-for-2027-replaced-by-an-all-new-555-hp-8-3l PartsNow News en 2026-09-25T12:17:39Z GM's 6.6L Duramax Is Gone for 2027, Replaced by an All-New 555-HP 8.3L