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Ok ive had XXX blocks i now have a YYY block its a 1987 block whats the differnce in the two?
 

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No difference as far as I could tell, the YYY block uses a roller cam just like the XXX. My block is a YYY and came out of an 87 Crown Vic
 

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"XXX" or "YYY" does not mean roller block or roller cam.
 
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