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I'm not sure what it should be on a new motor, but 100 psi is the lowest acceptable pressure per cylinder according to the Chilton's manual. Remember also that the lowest pressure cylinder should be within 10% of the highest cylinder, otherwise the engine could read a misfire. I have a '98 K2500 HD with an R-code 4 bolt main 350 Vortec, and my pressure is between 120 and 125 in all cylinders.

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