saw grinding polishing tips

[jerrycmorrow]

finally pulled my cheapo lowes dremel knockoff out and immediately developed a deeper level of respect for those of you who do porting.
all i'm trying to do is polish the exhaust port. i'm a pretty fart smeller but I don't know nothing about which stones to use or how to even identify the harder vs. softer stones based on color. or even how to polish after grinding.
bottom line - could really use some hints to get me started from some a youse guys. thanks muchly

 

[old-cat]

You can't grind aluminum with stones, you have to use carbide burrs or diamond burrs. First step to polish ex port, use emory cloth wrapped around an arbor.