Caterpillar 3406 Inline-6 Cylinder Block - Casting 8N8891 - Used Core / Needs Resleeve

Caterpillar inline-6 cylinder block (bare) with cast-in casting number 8N8891, a casting commonly associated with the Cat 3406 / 3406B engine family. Application: heavy-duty / marine / industrial Cat 3406-series (buyer to verify by engine serial number). Condition: used, untested rebuildable core — marked "RESLEEVE" by prior inspector, indicating liner bores are expected to need resleeving. No crank, rods, pistons, liners, or head included. Sold by photographs, identifiers, and dimensions; application not verified. Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.