The Department of Homeland Security, specifically the U.S. Coast Guard, is seeking quotations for the procurement of 28 units of the Cylinder Head 251 Plus as part of a core exchange program. This procurement is critical for maintaining the operational readiness of the U.S. Coast Guard's Medium Endurance Product Line, and only original equipment manufacturer (OEM) parts from Fairbanks Morse Defense will be accepted. Interested vendors must ensure compliance with specific packaging and marking requirements, including adherence to ASTM D-3951 standards, and submit their quotes by May 15, 2025, to Yvette R. Johnson at YVETTE.R.JOHNSON@USCG.MIL, with delivery expected by September 30, 2025.