O.S. Engines 21VZ-B V-Spec - Manual (Page 7)

ENGINE CONSTRUCTION
With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal. The cylinder bore
is a little tapered. The piston and
cylinder are designed to achieve
a perfect running clearance
when they reach their running
temperatures.
Around TDC
Cylinder Liner
When the engine is cold. When the engine is hot.
Piston
Crankshaft
A little tapered
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