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Using the Comp Cams tool with a handheld drill motor, we machined the valvespring seats out to 1.440 inches and reduced the guide diameter and the height with the   second Comp tool. But even with better springs, you are   limited to about 0.525-inch lift before you encounter   coil bind.    CHP
Iron Vortec Head

Using the Comp Cams tool with a handheld drill motor, we machined the valvespring seats out to 1.440 inches and reduced the guide diameter and the height with the second Comp tool. But even with better springs, you are limited to about 0.525-inch lift before you encounter coil bind. CHP  View Related Article

 

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