ok, so i did the leak down test. The back 2 cylinders, seemed to drop to drop slow, these r the two with oil in them. ( also the car has meen jacked up in the front for a day now, so oil would hav run back ). all the others either didnt drop, or dropped very very slowly. And i was using a comp guage. And it dosent seal very well at the o rings. I can hear it hiss from the sometimes.

it leaked slowly in the rear two cylinders.

Depending on how much oil is in there it's probably not leaking out past the rings either.. leaving you with a crack, bad HG, or bad valves. My vote is still HG or crack.

Is the coolant contaminated? Do a pH test and see if it's caustic.

IMHO, any way about it, the head is coming off.

Ok, so i just got the head off. And it is indeed a bhg. My question now is, what would hav caused the head gasket to blow if it was replaced only 6 months ago? it blew on cyl 1,3,5 between the cylinder and the water journals. Should i just put the new gasket in, or should i get the head shaved? thanks

How much work did you do to the mating surfaces before you put it back together? I would have measured for warpage on the head and the block with a gauge. Also if the head wasnt torqued properly in stages like it should be then there is another issue. Also did whoever did it use the old head bolts? You know those have to be replaced. If it were me (and with a 1JZ I dont run into the BHG problem like you do) I would take the whole engine out take it to a machine shop and have it tested for cracks first thing. Cre was trying to tell you what you already found. Have the surfaces checked for warps then if everything checks good install ARP studs and a new HG. From every 7M owner I know they Smack you if you didnt invest in them.

No, actually they don't. They need to be inspected, but they are not torque to yield bolts and may be reused.