I am new to the diesel world I've taken control of my fathers 2002 2500 HD 66 Turbo. Did a compression test over the weekend and all cylinders are between 775 PSI and 800 PSI is this normal? The only thing I can find online is that there should be a minimum of 300 PSI any advice and help would be greatly appreciated trying to get this thing back on the road. Also did a balance rates reading and have for bad injectors thank you very much for your help