Old 01-29-2012, 05:40 AM
  #9  
SPEEDNEEDS1
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Join Date: May 2006
Location: Pikeville KY
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I have ran the 454-R many times on several different engines and rthey all ran well, but the Merlin X is a new design and the same brand as the heads so I thought that the Merlin would better than the 454-R.
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