Cylinder Head Porting Using Carbide Bur Die Grinder Bit Tools
This is similar to what the dimples on a golf ball do. Flow bench testing shows that the difference between a mirrorfinished intake port and a roughtextured port is typically less than 1%. The difference between a smoothtothetouch port and an optically mirrored surface is not measurable by ordinary means. Exhaust ports may be smoothfinished because of the dry gas .