hey guys. i'm sure this has been picked over many times. but just want a specific answer. i picked up a set of 821 heads for my lq9. came out of a 2010 caddy. not exactly sure the milage but look to be in good shape. going to take them to a machine shop to have them inspected to make sure they're in good order. but would like to know if its fine to not have them machined? i didn't see any major nicks or anything in them. been reading a lot about ptv clearance. should i have any issues with stock ls3 gaskets if they don't get milled? or if they do get milled just to have a fresh surface, what gaskets should i be looking at? i plan on running the 228r cam from tsp. not going for something huge. just streetable. with some fun added inthanks guys. any info would be appreciated.