The valve timing on a 156 is set by finding TDC on #1 cylinder with a dial gauge and then locking the cams with the camshaft locking blocks (on #2 inlet and #3 exhaust). Loosen the 4 screws on the inlet cam sprocket and fit the timing belt. Adjust the timing belt tensioner so the pointer points to the hole and then re-tighten the inlet cam sprocket screws. You have done the valve timing.
Alfa Romeo is a car
Alfa Romeo was created on 1910-06-24.
Alfa Romeo is Italian.
Alfa Romeo is made in Italy.
Alfa Romeo makes their own cars.
Alfa Romeo Spider was created in 1966.
Alfa Romeo Giulietta was created in 1954.
Alfa Romeo Brera was created in 2006.
Alfa Romeo Arna was created in 1983.
Alfa Romeo MiTo was created in 2008.
Alfa Romeo Giulia was created in 1962.
Alfa Romeo Alfasud was created in 1971.