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MSD Circle Track HEI Distributor w Ignition Module For 1955 2003 GM V8 Vehicles 2008 2010 6.4l powerstroke (1) Dual S1 Faceplate FGXX 668603 (1) Dual S1 Faceplate When the factory CP3 injection pump pulls fuel under a vacuum it can introduce air and vapor into your fuel Works perfectly with MSD 8727CT HEI Circle Track RPM Control MSD engineers have worked tirelessly to perfect the new circle track HEI
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