Diameter of inlet port.

[Deleted account 111026]

If anyone has an airhead cylinder head,(that uses a 40mm diameter carburettor), lying around, could you tell me the inside diameter of the inlet port at the carburettor end, please?
TIA.

 

[(RIP) Proff]

Leaded or Unleaded head ??
IIRC the unleaded head is slightly smaller ID

 

[Deleted account 111026]

Thanks for the reply, Proff, I took the carb off a mates bike this afternoon and now have the dimensions I need.