I have (what I understand to be) a p76 V8. Dont ask me if it's similar to your engine - I'm no authority there!
My heater has been bypassed - I bought it like that. It appears that in order to achieve this, all that's been done is that the water pump outlet/inlet pipes have been cut and plugged. Nothing more complex. The ends of the pipes are sitting on the valley pan.
I can try to take a photo, but no guarantees you can see anything as it's quite congested in the V valley area - at the fan end.
However, I am also led to believe that having a functional heater is a roadworthy requirement (if it were to be reassessed) - I assume it's because you need a way of demisting the windscreen so you can see!
Anyway, that's my 2c.
Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
Sadly Gone: '77 RRC 2 Door aka "Beast"
Gone: '92 RRC Vogue SE aka "The Family Bus"
Long Gone: '99 Td5 Defender aka "The TANK!"
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