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			#11  
			
			
			
			
			
		 
		
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			Open
		 
		
		
		
		
		
		
		
		
	
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			#12  
			
			
			
			
			
		 
		
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			According to a 1987 General Motors Performance Parts catalog I have:  ID # 3947886 is part # 3959105 Piston assembly STD, 427 CID, Chevrolet 68-69 W/H.D. & Aluminum Block (RPO L-88 & ZL-1) 12.5:1 Open Chamber, Forged Aluminum, Floating Pin Design, Use retainer P/N 3942423 (I.D.3947886 or 3959108)  I hope this helps. 
		
		
		
		
		
		
		
		
	
	Bill  | 
| The Following User Says Thank You to Big Block Bill For This Useful Post: | ||
 the427king (02-10-2022)  | ||
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			#13  
			
			
			
			
			
		 
		
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			Thank you BB Bill.... 
		
		
		
		
		
		
		
		
	
	RA  | 
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			#14  
			
			
			
			
			
		 
		
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			Your welcome, glad to help. 
		
		
		
		
		
		
		
		
	
	Bill  | 
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			#15  
			
			
			
			
			
		 
		
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			Open chamber.
		 
		
		
		
		
		
		
			
				__________________ 
		
		
		
		
		
	
	Ebay Auctions http://www.ebay.com/sch/427-king/m.h...=16&_rdc=1 No Fisher priced toys here  | 
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			#16  
			
			
			
			
			
		 
		
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			1967 1st design L88 was closed chamber.
		 
		
		
		
		
		
		
		
		
	
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			#17  
			
			
			
			
			
		 
		
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			Thanks, Im looking for 1st design pistons that work with the 3919842 aluminum heads. It has around 106.8cc closed chamber head. I thought the combination could work one way, but not the other. I donÂ’t think open chamber pistons will work with a close chamber head.
		 
		
		
		
		
		
		
		
		
	
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			#18  
			
			
			
			
			
		 
		
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			No they will not 
		
		
		
		
		
		
		
		
	
	Bill  |