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			 Registered 
			
			
		
			
				
			
			
			Join Date: Feb 2005 
				Location: Atlanta Metro 
				
				
					Posts: 219
				 
                
				
				
				
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			Has anyone 'upgraded' their pre '91 3.3L by swapping to the '91-92 all finned P&C set?  If so, any modifications needed on the tins on the cylinders?  I'm looking at a new set of these that are being sold almost too cheap to pass on.  I've heard that they'll run a bit cooler than the half-finned originals, but I wasn't sure if they are a 'bolt-in' upgrade or if there's more to the picture.... 
		
	
		
	
			
				Thanks!!  | 
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			Join Date: Mar 2002 
				
				
				
					Posts: 3,563
				 
                
				
				
				
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			I have fully finned 97mm cylinders in my Carrera motor.  I don't think any extra machining was required as such to make them fit. 
		
	
		
	
			
			
				
					I had the base of the cylinders machine as I was running thicker (0.5mm) base shims as well as the 0.5mm C2T head gaskets. 
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	Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition  
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