Good quality masking tape on engine block?

[chewychevy67]

I'm going to be painting my engine block here soon. I will need to degrease it and metal prep it. Is there a tape I can use so to keep these out of the exhaust valves and such? I just did my intake manifold separately and the tape I used became soft as soon as I used metal prep and paint/ cleaning solutions bled inside. On the block I can't have this happen as it is assembled and the intake and oil pan are already painted separately . Thanks.