For the 2004 model year, the EZ30 was revised to add the Subaru active valve lift system to the intake cam, providing both variable valve timing and lift for the intake valves, which resulted in increased power, torque, and economy.
The cylinder heads for the EZ30D mk II were also revised to include three exhaust ports per head instead of the single exhaust port used in the original EZ30D mk I, which gathered the exhaust from each cylinder bank into a single port.
Other detail improvements included a new block casting and a reduction in overall weight by 8.91 kg (19.6 lb), achieved through the use of hollow-journal camshafts, reducing the number of bolts in the timing chain cover, and switching to a plastic intake manifold.
For the 2004 model year, the EZ30 was revised to add the Subaru active valve lift system to the intake cam, providing both variable valve timing and lift for the intake valves, which resulted in increased power, torque, and economy. The cylinder heads for the EZ30D mk II were also revised to include three exhaust ports per head instead of the single exhaust port used in the original EZ30D mk I, which gathered the exhaust from each cylinder bank into a single port. Other detail improvements included a new block casting and a reduction in overall weight by 8.91 kg (19.6 lb), achieved through the use of hollow-journal camshafts, reducing the number of bolts in the timing chain cover, and switching to a plastic intake manifold.
Subaru six-cylinder engines