The 1SZ-FE uses a DOHC valvetrain with narrow-angle valves (29.7°). It does have hydraulic lifters; clearance is adjusted using different-sized lifters. Intake: 0.15 – 0.25 mm (0.006 – 0.010 in). Exhaust: 0.25 – 0.35 mm (0.010 – 0.014 in). Vital Top-End Features Cylinder Head Bolt Torque Specification Needed? - 2CarPros
When reinstalling the cylinder head, the bolts must be tightened in a specific sequence—usually starting from the center and working outwards in a spiral—to prevent warping. : Tighten all bolts to Step 2 : Mark the bolt heads and turn them exactly 90∘90 raised to the composed with power Step 3 : Turn the bolts an additional 90∘90 raised to the composed with power 180∘180 raised to the composed with power total after the initial torque). 3. Timing Chain Alignment 1szfe engine manual top
Need a specific torque value or diagram reference? Consult the official Toyota 1SZ-FE Engine Repair Manual (Pub. No. RM910E). The 1SZ-FE uses a DOHC valvetrain with narrow-angle