Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. | 
	
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			I've had two 512 blocks with the casting date on the back. Both had the reliefs for the larger crank. One was a 2 bolt LE 69 Impala motor(forget the date). The other is a June 69 4 bolt CE motor. 
		
		
		
		
		
		
		
		
	
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