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Once the flat-tappet cam was broken in, the inner springs were put back in their places-inside the outer spring. Valve lash was reset on both cams after initial cam break-in and warm-up (25 minutes). Going to the roller, we lost 23 peak horsepower, but gained 21 lb-ft of torque. Peak horsepower came in at 400 rpm less, and peak torque came in at 600 rpm less-good for street drivability in our 4,000-plus-pound B-Body.