truck wont stop smoking after engine rebuild

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Hi, I have a 2003 gmc sierra k 1500. I have a t4 76 trim turbo on it. in spring i broke the pump on the trans so i replaced it test drove and it was ok. After the test drive i parked the truck and it was idling in the shop, i walked away for a couple minutes and came back to a shop full of smoke. as i was running to the truck to shut it off, I heard it knocking. I towed it home, pulled the engine and found some worn bearings, so I started a rebuild. I came across a aluminum 5.7 block so i used that along with my rotating assy,( stock 5.3 crank, eagle h beam rods, diamond pistons, new wiseco rings and clevite bearings). So I got it running wednesday and it was idling for about40 minutes and just started smoking. Badly!. So, I was checking things out and noticed, a black, oily fluid dripping from the right exhaust manifold. So I pulled the plugs and checked compression, all 8 cylinders betwen 175 and 180 psi. So I performed a leak down test, all less than 10% leakage. So I was thinking maybe valve seals, as it was smoking just like before the rebuild. I replaced the valve seals last night and started it this morning with the same results. The truck is not overheating, but I am thinking poss. a head gasket didnt seal up right. the smoke is whitish but i am running water. so it shouldnt smell sweet and doesnt. I have no milky oil or sign of compression, in the coolant tank. I am thinking of draining the water, putting coolant in and see if the smoke has a smell. Any ideas or suggestions? i work on cars for a living I am an ASE master tech, and have been working on cars professionally for about ten years now and i am completely stumped. Am I overlookig something simple? also i pulled the intake tube off the engine to see if it was possibly turbo seals. the throttle body has no residue on it. and with the engine running no smoke is coming through the intake tube. again any ideas would be great.

Seth.

 

did u check the tune dose the smoke smell like gas?

 

never did this before the new engine? basically all ireplaced was the block. and i really am sure its not a fuel issue. thanks.

 

it sounds like the turbo? but the smoke would be grayish. maybe your leaking some water some how from the turbo into the the intake? do you have any end shaft play in the turbo?

 

smoke is gray. how could water come from the turbo?

 

is it a water cooled turbo or just oil?

 

check the end shaft play on that turbo. it shouldn't any play.

 

i guess its just a oil cooled turbo?

 

yeah, oil cooled

 

check the intercooler. from your last engine it may have blown some oil into the intercooler.

 

no residue at the throttle body, way too much smoke for something like that. Thanks.