Pistons
			 
			 
			
		
		
		
			
			Toby  
Your engine sounds like an early 50's splash feed , and if it has a 3. 9/16 bore then it probably would be a 235 cubic inch chev engine. 
Parts should be available from Automotive Surplus in Melbourne . 
Have a piston measured at 90 degrees to the gudgeon near the bottom of the skirt with a micrometer or digital vernier. 
It's highly likely that it will be of std size. 
Regards 
Jim S.
		 
		
		
		
		
		
		
			
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				jim sewell 
cmp and cckw
			 
		
		
		
		
		
	
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