Table: toledo_engine_specs
Columns: model
cylinders_valves
displacement_cc
max_power_kw_ps_at_rpm
max_torque_nm_at_rpm
engine_code
top_speed_km_h
production_period

Question: what's the cylinders/ valves with model being 1.8 20v
SQL: SELECT "cylinders_valves" FROM toledo_engine_specs WHERE "model" = '1.8 20V'