I bought a set of these from this exact seller back in 2019 they arrived fast I got a great deal on them and I was absolutely blown away by the casting there was zero core shift the valves the springs the keepers everything was perfect, installed height everything! very very little casting flash hold and smooth casting lines, completely flat machining didn't even really have to clean them I'd say these heads are probably hit or miss and I got lucky, idk but I'm pretty happy with mine. anyways here's my setup. I installed them on a stock 302 block from a 87 gt it has a TFS 1 cam, rpm air gap intake, comp 1.6 roller rockers, Edelbrock 1406 600 CFM carb, msd digital 6al box, pro comps version of an msd pro billet dizzy and hooker long tubes with 1.5" primarys because that's all that they make for my chassis (76 mustang Cobra ii) the car has a t5 that I pulled out of a V6 sn95 converted it to work with a V8, 3.80:1 gears, posse....it screams! No valve float at 6k and that's as far as I'm taking it. I won the auction and I think I paid $420 shipped back then. Again, maybe they are Hit or Miss but I'm happy with mine, when they come back off I'll do a little porting and gasket matching. I also cc'd them they were advertised as 190/64 they were actually 195/64. I had ported iron gt40p's before these heads and I would say they made more power down low but this combo and these heads there's still a lot of good low-end torque, they don't start coming alive until slightly higher RPM I've tried them with a stock 440 cam as well and it does the same thing they really come alive above 3,500 rpm. Hope this helps anyone thinking about buying these hopefully they're still the same and they haven't changed I know the price has though I'd buy another set if I could get them for 4 or 500 bucks again but if they are almost $1,000 now I'd probably just save for a set of some Tfs or afr heads.