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					Originally Posted by  Jake Raby
					 
				 
				The 2.7 by far is THE best engine. This goes for the 5 chain and 3 chain variants. 
 
Last year I only saw 2 of those engines fail, and one had 190K miles on it when it popped. 
			
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How do you tell a five chain from a three chain? What would entail installing one on a '99 Boxster Tip in place of the 2.5L Tiptronic? Would it be the least expensive bang for buck replacement if the 2.5L goes? Thanks.