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There are four water drain vales in the same location, if you look closely at the image the forward hole has a lever protruding from it, this is the water drain cock. For the measurements, they are 17.25 inhces apart, fore and aft. and 18 inches across, measured centre to centre.
The rear one may also give access to the MG synco point, but the hole does seem a bit small for a hand.
That is deduced from the HS engine drawings.
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