The 4.0 L (3,968 cc/242.1 cu in) all-alloy 1UZ-FE debuted in 1989 in the first generation Lexus LS 400/Toyota Celsior and the engine was progressively released across a number of other models in the Toyota/Lexus range. The engine is oversquare by design, with a bore size of 87.5 mm (3.44 in) and stroke of 82.5 mm (3.25 in). It has proved to be a strong, reliable and smooth powerplant with features such as 6-bolt main bearings and belt-driven quad-camshafts. The connecting rods and crankshaft are constructed of steel. The pistons are hypereutectic.In its standard, original trim with 10:1 compression, power output is 191 kW (256 hp), torque of 353 N·m (260 ft·lbf).The engine was slightly revised in 1995 with lighter connecting rods and pistons and an increased compression ratio to 10.4:1 resulting in peak power of 195 kW (261 hp) and torque of 363 N·m (268 lb·ft).In 1997, Toyota's VVT-i variable valve timing technology was introduced along with a further CR increase to 10.5:1 bumping power and torque to 216 kW (290 hp) and 407 N·m (300 ft·lbf). In the GS400 application, output was rated at 300hp and 310 ft-lb of torque.
The 1UZ-FE was voted to the Ward's 10 Best Engines list for 1998 through 2000.This particular engine is based on one from a 1998 Lexus GS400. It is completely stock except for a K&N FIPK intake. Credits to marian, DW26, and AD9 #1uz #1uzfe #4cam #celsior #gs400 #lexus #ls400 #toyota #V8