Lapping in valves

Yeppers,my kind of build...
FWIW,O'Reilly's does make a rough/smoother grit ,two tube pack. About five bones,Versa-Chem part number 13209. Used it on my Magnum build,helps having multiple grit compounds.
Thanks for the info, I agree it will help at some point to have a heavy and fine grit, maybe not with this project but possibly the next. At 4.29 I can get this two pack and the permatex, I can store what I dont use.