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What is the compression psi on a 1990 engine?

I need more information to answer your question. "1990 engine" is too vague. Please tell me:

* What kind of engine is it? (e.g., car engine, motorcycle engine, airplane engine, etc.)

* What make and model is the engine? (e.g., Ford Mustang, Honda Civic, etc.)

* What size is the engine? (e.g., 2.0L, 4.0L, etc.)

Once I have this information, I can look up the recommended compression psi for your specific engine.