The heads i got had casting flash everywhere only weighed about half as much as a set of any other aluminum heads i've been around which isnt always a bad deal. But when screw in studs pull out well before there actually torqued tight is not a good deal. Im not knocking all aussie or pro comp heads at all. This is just my experience with these pro comps. I talked with lots of guys with these heads that liked them alot so maybe it was a bad set. Lots of strange looking heli coil stuff in the heads i got. These are new. I've had a couple engines go and if this one went because a stud pulled what a shame. I had actually argued how good these were on here with others who told me to stay awayfrom them so pistol i know where your at., Sorry for not listening everyone hine sights 20-20.