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What was helping all that heavy breathing? First, our Trick Flow 215 CNC heads are capable of moving up to 320/259 intake/exhaust cfm at 0.600 inch lift. We also had some serious help from Comp by using the company's Ultra-Gold 1.72:1-ratio roller rockers and matching 7 1/2-inch-long, 5/16-inch Hi-Tech pushrods with 0.080-inch wall thickness. Mena first removed the rockers to allow us to remove the camshaft.