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Superlift 4" Rear Block Kit 69 72 GM 1 2 & 3 4 Ton 4WD 3549 s2000 ATS strongly suggests replacing the FGXX 668603 ATS strongly suggests replacing the plastic coupler with our billet aluminum filter coupler (ATS PN: 301 021 2326) The MAF sensor is moved significantly further down the intake tube by employing a MAF Extension Harness and Harness Bracket We are proud to provide the truck 4 inch Rear Block Kit 1969 1972 Chevy 1 2 and 3 4 Ton Pickup 4WD
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