11 psi is the max for a 617, but 14 psi is normal for a 603. You
will get a bit more power at 11 than at 9 on a 617, but you will get
greatly accelerated engine wear above 11.
Note that the intake pressure and fuel delivery are related but not
by a fixed amount. The governor will reduce the fuel even at high
pressure if the engine speed is correct, although if you are not at
high load, this will also reduce the pressure, but not in a linear way.
Peter
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