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valve reliefs
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  1. 2003 - 2004 SVT Mustang Cobra
    hey guys had some custom 18cc pistons made and they only had the option for 2v valve reliefs and im going to run the comp xer 274 cams they are .475 lift so i need to know if i need valve reliefs for these cams or do i have them shelve the pistons and pay another 135 to make new ones with 4v...
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