Comp Cams 127350 4.6L / 5.4L 3V XFI VSR Stage 2 Blower Camshafts

The Comp Cams XFI VSR Stage 2 Blower Camshafts are suggested for applications with a built bottom end running 10 - 16lbs of boost. VCT can still be used for optimal performance. These Camshafts do require upgraded valve springs but can be used with the stock phasers. Nice lope at idle with solid power gains in the upper RPM range. Shift points around 6400 - 6600 RPM. Best if used with 3.73 - 4.10 Gears and a 3000 - 3200 stall. A custom tune is recommended for maximum power gains.