Rod, 
This is a power pack from a Matilda II, they are Leyland engines, models E148 and E149. 
 
The AEC engines which were also fitted had a slightly longer stroke of 130 mm. 
 
Note that the word before "ENGINE" on the plate has been obliterated, it would no doubt have said LEYLAND. I have said this before that I am of the belief these makers names were removed to hide the manufacturing source of munitions. 
 
Richard
		 
		
		
		
		
		
		
		
		
	
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