The engine in the Cat 323D 323DL 323DS
Fitment for the Cat 323D 323DL 323DS centres on the Cat 3066T: 5.8L / 354 cu in, 6-cyl inline, 100 x 125 mm bore x stroke, about @ 2200 rpm, Tier 2. Serial number on the block settles the exact version. New-surplus and rebuilt stock ships from Houston.