I get emails or calls on warm holes or boysen ports or whatever you want to call them. These holes that people drill into the intake are only necessary when the intake piston window closes off to late or early. They are necessary in some engines. The angle and taper are critical for those ports. I gained 10 horsepower today doing these ports; the cylinder needed them from the big stroke engine closing off the intake window.
Be careful on how you do them.
Be careful on how you do them.