Head Porting Advice

I find a higher speed with carbide works better for me. Don't try to cut too much at a time just touch the casting lightly. Also wear a thin leather glove on your opposite hand and use your index finger to steady the carbide shaft near the valve seat. I have never used stones at all. After you make your cuts with the burrs use various shaped sandpaper rolls to smooth down the roughness. Most porters will tell you to leave the surfaces somewhat rough to aid in dispersing the fuel droplets. As always my advice is worth what you paid for it. Dan