Essentially it's a mini-me, only newer.

Picture honda engine codes

ie. D16A6, D15B7, D16Z6, D16Y8, B16A, B18B1, B18C1, etc.

The first letter is the series of engine,

D-series, B-series, etc. (we all know there are many)

The first number is the displacement.

D16 = D-series 1.6 liters. B18 = B-series 1.8 liter

After that is essential stating what head it came with.

A6= 4gen si head Z6= 5g SI/EX head C1= GSR C5=ITR, etc.

Any 4th gen or new D-series head will fit on a D-series block, so the swap is doable.

To put a Z6 head on you D16Y6 would make you engine essentially a 6g EX engine, since the Y8 EX head is very similar. The best way to do this would be fine a 6th gen EX Ecu and add in the VTEC solenoid wires, you should be set...

Good luck...

Jung