Dump it out grab some cheap oil to use while you test it
just stick the turbo feep into a container
Then if the motor tests ok dump the cheap oil and fill with something good
If the system is sucking in air it could be an airlock and what you're seeing is a temp spike as the steam builds up then the T Stat opens and water flows enough to bring the temp gauge down!
The scarey/sad part of this is that it's a perfect way to anneal an aluminium head :(
The 4202 with the 102mm exducer is a 53 trim so I'm guessing it has the 73mm inducer.
Both use a 82mm 84 trim Turbine with 1.15 AR
<ninja edit> Just checked it's a 74mm inducer
Bare head will be fine
Open throttle 100% Crank 2>3 times for each cylinder and have a backup battery and jumper leads ready in case it gets low.
Watch the gauge it'll peak and then drop back a touch this is enough any more cranking will just flatten the battery!
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