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			Heres what I have found out.And I thought WDC means Winter die casting
 
 Can-Am blocks 68/69 - Winters
 # 0-294550 = 4.250" bore with steel liners Experimental Prototype 67-68 Dry sump (427 ci)
 # 0-321270 = 4.440" bore with steel liners Experimental Prototype 68 no boss for mechanical fuel pump(430, 465 ci)
 # 0-326711 = 4.440" bore with steel liners Experimental Prototype 68 (430, 465 ci)
 # 3946052 = 4.440" bore with steel liners (430, 465 ci)
 # 3946053 = 4.440" bore with steel liners (430, 465 ci)
 
 Can-Am Block 70 Winters
 # 3946052 = 4.440" bore with steel liners (494 ci)
 # 3946053 = 4.440" bore with steel liners (494 ci)
 
 Can-Am blocks 71-72 - Reynolds
 # O-399204 = 4.5" bore and steel liners (509 ci)
 # O-495102 = 4.5" bore and no liners
 
 ZL-1 Factory blocks - 1969 - Winters
 # 3946052 427 ci.
 # 3946053 427 ci
 
 ZL-1 Factory blocks - 1997 & up
 # 3946053 427 ci.
 
 # 3992038 may be 4.44" bore w/ Liners - era?.
 
 # 3946052 Yenko Casting LC 427
 # 3946053 Yenko - Casting has YENKO
 # 3946053 Yenko - Casting has Y E N K O
 # 394605Y Yenko - Casting has Yenko Crest Logo
 
			
			
			
		
			
			
			
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