My book says that you need 220psi for reliable starting measured cold.

I am not sure why such a big deal is made of testing them hot. When you really need to know how they are is when you want to start them from cold.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.