Pretty sure all spreadbore engines have the larger gudgeon pin. If the gudgeon pins on your current engine measure 7/8 inch you have the larger ones, if they measure 11/16 inch you have the smaller ones.
Been a while since I purchased a set of pistons but with high value of the AUD it may be worth getting a price from Dunsfold, Craddocks etc. from England.


 
						
					 
					
					 
				
				
				
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