F225 powerhead

I need a part number for a F225 powerhead.
I have a pair that needs replacement due to hydrolock.
Also what exactly is on the powerhead, does it come complete with cyl. heads I assume?

[boats.net]

You didn't say what year the motor is, the heads do not come with short block on four stroke models.
Number 1 in diagram is the short block assemble, diagram is for a 2002 model.
Yamaha Outboard Parts 2002 F225TXRA CYLINDER CRANKCASE 1 Diagram
The cylinder head assemble are number 1 and number 8 in diagram
Yamaha Outboard Parts 2002 F225TXRA CYLINDER CRANKCASE 2 Diagram

You didn't say what year the motor is, the heads do not come with short block on four stroke models.
Number 1 in diagram is the short block assemble, diagram is for a 2002 model.
Yamaha Outboard Parts 2002 F225TXRA CYLINDER CRANKCASE 1 Diagram
The cylinder head assemble are number 1 and number 8 in diagram
Yamaha Outboard Parts 2002 F225TXRA CYLINDER CRANKCASE 2 Diagram

Sorry, F225TXRC 2004. That confirms my assumptions on the assemblys.
Thanks