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Dose any one know the compression ratio on the LLY? Just want to know. Thanks.
 

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It is 17.5 :1 on the LB7, and I don't recall any mention of a change, so I'm pretty sure it's 17.5:1 on the LLY too.
 

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17.5 is what it says on GM's media web site for both engines.
 
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