White Smoke/ Very High EGT's

[smutts]

it has a very high egt (up to 1750°F)

Thats about 950C, which should have the manifold glowing yellowy orange! 
That IS hot, are you sure the gauge isn't telling lies?

[Smokey Eddy]

There isn't a spark plug hole to drop a pencil down is there.

You could remove the injector closest to the tranny and drop a long stick down the prechamber hole and rotate the crank until the stick is at it's highest point. As such you would with a pencil through a spark plug hole. You just need something thinner and a new heat shield to put the injector back in.
The pistons 1&4 and 2&3 move together.

[Runt]

Eddy, that is what is being recommended, only using a valve.  Let the valve drop onto the piston (near TDC!) and measure the valve to determine tdc. 

GTD:
IIRC, It has been measured that the gasser flywheel marks are about 5 degrees different from the diesel flywheel marks.  I do not have a gas one to compare to, so I can't confirm that, but 5 degrees may be enough to cause you issues, in at least one case it was the suspected cause of (repeated) valve piston contact.
I agree, start by confirming TDC, then double check the cam and IP timing to the crank.  However, I am not certain that this problem would give you white smoke, and in fact I think that timed by ear, or trying multiple timing points should have resolved the white smoke even if the cam/crank timing was out a little.
I'll be paying attention to what you find, so please do update us when you find a problem/solution.

[Mark(The Miser)UK]

I cant say how many mm timing i run , because my dial indicator adapter doesn't fit into the 10mm Head that i fitted into the pump...
The pump mods are : 10mm head, Governor main spring shimmed completely, timing advance piston shaved to get more advance.
So i have timed it by ear and warm start cranking time for the moment...
If i retard the timing i have to crank it 5 to 7 seconds to get a warm start.
But i dont think that the timing is the problem, because i tried it with 2 other pumps that were completely stock except a gov mod, and tried timings of  0.95, 1.0 and 1.05 but that only changed the warm start cranking time, not the high egts or the white smoke...
Downpipe is 2.25", exhaust is 2.5" .
Intercooler is a Stock 80HP GTD unit.
I just upped the fuel to see if its too low to get more boost.
Before the k24 i had a k14 on it with the wastegate disabled, and had the same egts (at this time i thougt the egts are made by the restriction of the way too small turbo)

Another thing that i mess about is that it  now only runs 160kph, 2 months before it used to run almost 200kph.

the engine has 270k miles on it and got some blow by (Oil filler cap dances a bit but doesnt fall down when i open it and lay it on its hole )

To check true blowby, at idle, squeeze the cam cover vent to stop the vacuum effect of the engine. True blowby pressure will become apparent. If the white smoke is a new issue and other pumps do not cure it, then you have a compression issue.
Probably rings, but possibly a valve not shutting properly....

[Smokey Eddy]

Eddy, that is what is being recommended, only using a valve.  Let the valve drop onto the piston (near TDC!) and measure the valve to determine tdc.  

Yes, i know that's what is being proposed. I just find it much easier to remove an injector than a valve. That's all i was saying. But i suppose a valve would be much more precise as it is straight on to the piston face.
I'm one of those "do it cheap & easy ... c'mon it's a vw" kind of guys. But then again, my build DID throw a rod so there is something to be said there. And i think it is, "don't listen to smokey eddy. he's a moron."

ps. I'd also be terrified of being 180 degrees WRONG and losing the valve into the cylinder. What a disaster that would be...

[vanbcguy]

No need to remove a valve - to "drop" a valve you simply rotate the camshaft.  Works just like a piston stop...

[Runt]

No need to remove a valve - to "drop" a valve you simply rotate the camshaft.  Works just like a piston stop...

Nice, I wish I'd known/thought of that before.  Oh well.  Thank you for the hint.