The EZ30D engine had a die-cast aluminium cylinder block with 89.2 mm bores and an 80.0 mm stroke for a capacity of 2999 cc. Within the bores, the EZ30D engine had monoblock cast iron cylinder liners. Compared to the 2.5-litre EJ251 four-cylinder engine, the EZ30D was 20 mm longer and 40 kg heavier.