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The Goodman B4022700 3-Inch In-Shot Burner is a genuine OEM combustion burner for the Goodman/Amana AMS80403AXAB multi-position gas furnace. In-shot burners deliver a precisely shaped flame into each heat-exchanger tube, ensuring complete combustion, quiet ignition, and even heat transfer. Replacing a corroded, rusted, or misaligned burner restores reliable lighting and eliminates delayed-ignition rollout.
Genuine Goodman burners are stamped to the exact venturi and port geometry the AMS80403AXAB was certified with, so flame carryover, ignition timing, and CO output stay within spec. Generic burners can shift the flame pattern, causing hot spots on the heat exchanger and nuisance flame-sensor faults. For a safety-critical combustion part, OEM is strongly recommended.
Moderate (3/5) — Requires removing the burner assembly and aligning the burner to the heat-exchanger inlet. Shut off gas and power, verify flame carryover after install, and confirm no rollout on startup. Professional installation recommended.