"gas" is what its called. Basically its just air bubbles in the casting. Theres absolutely positivily nothing that can really be done to fix this. Its a casting flaw, sometimes you can sand through the gas pocket but it can get worse the deeper you sand. The foundry either had inferior materials in the casting or they had the alloy way to hot when they poured it into the molds.
I do alot of GM parts 85-04 parts, who ever casts them still do a poor job cause I still get as much gas in the new parts as I do in the old ones. The GM intakes are the worse, on every single LT1/LT4 intake top where the accent lines are theres gobs of gas pockets.
Your plater should be able to get around the gas. Does she crome coat everything or actually go with the nickel,copper,chrome
