Have now measured up the Rover M16 inlet manifold --
The max heigjht is 8" measured from the port centre line.
And the width measured from the port mating face to the front corner is a bit under 7.5" -- added to this will be adapter plate thickness so say
7.75" including allowance for engine vibration.
[Edited on 18/4/06 by britishtrident]
Rescued attachment face.jpg
top view
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