My 1998 grand prix 3.1l gm motor has low compression and none in one cylinder.?

[Tim P]

I changed front head because valve was stuck open. Put new head gasket in and intake gasket kit in and put back together, Started and ideled for a bout two mins and now there is now no compression in the same cylinder that had the problem last time? Any ideas i am at a complete loss here and have no idea what to do. I am pretty mechaniaclly inclined and think mabe bent crank! no clue anyone with an answer please feel free to email me thank you Please help
I did check compression before i did it. And like i said it ideled for a few min just fine, so I am pretty sure it is not pistion rings. plus i looked at the cylinder walls and they looked fine, I.E no marks, wear, gouges, or anything else to worry me that way
Timing chain looked fine, no shavings or anything out of the ordinairy. thanks for all of your ansers guy you have been very helpful. Thinking maybe just get a junkyard good running motor and swap out good intake gaskets and new head gaskets might be my best option seeing as I am pretty sure by the thoughts here this motor is pretty much toast. Thanks

 

[wonderboy n]

do a leak down test . you got wind noise in the intake its the intake valve . wind noise out valve cover its rings or pistons

 

[AustinC]

um did you do a piston ring check to make sure that your ring were sealing properly before you through the head back on that ood be the problem now that the rings arent sealing as tight as they should be