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If you'd like, Survival can improve the Performer RPM's airflow with its "Stage X" hop-up. This includes larger intake valves (2.20 vs. 2.09), smaller valve stems (11/32 vs. 3/8), a CNC-cut valve job, some hand blending in the bowls, and double valvesprings to withstand the rigors of bumpier cams. "We pick up somewhere between 20 and 30 cfm pretty much everywhere on the normal curve for the camshaft on airflow, and that has a direct translation to power potential," says Barry. View Related Article
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