Is this a new engine or old? How's the flow look out of the top hose? If it's climbing at speed it's a coolant flow problem. Have you reverse flushed the engine? Block to head passages tend to plug over time.
Hey Claus
Don't mean to highjack, but did you get the new engine running right?
Wanting a Custom fit in an off the rack world.
I don't have time for a job, I just need the money.
