Internal dimensions of 20V head wanted.

[Crampy]

Hi all.
Just wanting to know what the distance is from the inlet valve face to the end of the intake port of the head on a 20V 4AGE is please? From a Blacktop, but I'd say Silvertop wouldn't be much different.
Either just the head itself, or total distance with the throttles attached will be handy cheers.

Probably easier for someone who has a disassembled head.

Thanks in advance.