381279 Exhaust Manifold for CATERPILLAR 3400 Series Application

It’s a diesel engine exhaust manifold designed for Caterpillar 3400 series engines in heavy-duty applications. It routes exhaust gases from the cylinder head into the exhaust system to support proper flow and performance. It’s intended as a replacement option within Caterpillar 3400 series engine parts.

It replaces multiple Caterpillar OEM part numbers, including 1017354, 1028503, 3863060, 4W4384, and 6I3655 (and dash-formatted equivalents like 101-7354 and 102-8503). Matching your current casting/part number and engine application is the best way to confirm fit. If you’re unsure, verify with your engine serial or existing part number before ordering heavy-duty truck exhaust parts.

Check that your engine is a Caterpillar 3400 series and cross-reference your existing manifold’s part number to the listed replacements for this Caterpillar 3400 series exhaust manifold. Also confirm basic specs like the approximate weight (23.08 lbs) and overall application to your exhaust setup. If your truck uses Caterpillar 3400 series engine parts, this diesel engine exhaust manifold is typically selected when those OEM numbers match.