Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. | 
	
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			Someone is trying to sell me an L72 427 engine with block casting number 3916321.  I need your expertise to tell me if this could be a true L72. If it is a correct number, I will look further into the other markings on the engine. What other block castings were used in 67-68 L72 engines? 
		
		
		
		
		
		
		
		
	
	Thanks for the help!!  | 
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