Intake valve diameter is 33.5 mm exhaust valve diameter - 29.0 mm. The first generation 2GZ-GE had an aluminum cylinder head with a straight forward design - four valves per cylinders, centrally located spark plugs, and belt driven double overhead camshafts. ![]() A new crankshaft with increased stroke also required longer connecting rods (they are hot-forged). The 2JZ engine block is taller than 1JZ due to increased stroke by 14.5mm (0.57 in). The cylinder block is made of cast iron, strong and durable material. ![]() The general architecture of the 2JZ is similar to the 1JZ, but it is not just a simple stroked version.
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