Need help with my 2000 celica gt-s Options

[bccentaur3]

So I've noticed that my gts has gotten a bit sluggish lately and burning up oil like there is no tomorrow. To be honest I enjoy driving my 6th gen GT more than my 7th gen. Any way at WOT i would get black smoke coming out like crazy. At first I thought dang I'm running rich. Then lest say after an oil change after 3 days of regular driving all my oil is gone. I was thinking how could this be. I know its not a leak because its not and I'm blowing smoke, but its not blue smoke, so it can't be the oil could it? Well I decided to do the compression test and I got 120, 220, 170, 200. So cylinder one being 120 has to be the culprit. So I'm thinking dang my valves are screwed. But I shouldnt be burning oil that much even with a bent valve. Could this also be my piston rings? O btw I'm also having random misfires. A mechanic qouted me 1700 just for the head getting rebuilt. I honestly think the price is way too steep. I need you guys' opinion on this. Thanks for reading.

[supra12big]

umm, i used to own a gts myself, they are alot nicer to me then the 6th gen, lift is tight too, umm about ur problem, u need to have a compression test done, and add oil and see if that increase the compression if it does then ya thats ur rings, if u have a bent valve, theres a smoke test u can do, when u put the motor in full power stroke(compression) where all the valves are closed, that off the exhaust and intake manifold, and shoot the exhaust in from the top, if smoke comes out then ya the valves are bent