1999 Pontiac Trans Am SLP Performance Parts Test - Trans Slam
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Spark-plug access actually improves after bolting on the SLP headers. Before installing the EGR and smog pluming, we tightened all the header bolts from the inner to the outers. We made five passes on the bolts until they were all torqued to 18 ft-lb. We will retorque the header bolts (cold motor) after the engine goes through a dozen or so hot and cold cycles. View Related Article
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