The engine in the Caterpillar 303.5E2
Fitment for the Caterpillar 303.5E2 centres on the Cat C1.7: 1.7L / 104 cu in, 4-cyl inline, 75 x 97 mm bore x stroke, about @ 2800 rpm, Tier 4 Final. Serial number on the block settles the exact version. New-surplus and rebuilt stock ships from Houston.