07-05-2016, 07:48 AM
As long as your tires are rated for 75, there should be no issue in running 70. Your engine redline is 2100 rpm and you will be below 2000 rpm at 70. The 8V92 will run wide open at 2100 rpm and actually enjoy it. Torque is 1450 lb-ft at 1200 rpm. The caveat is watching the temperature. I HIGHLY recommend using VMSpc to get real temperature and pressure readings rather than relying on the less accurate dash gauges. Normal coolant temperature is 180-195 (Detroit specs say 170-195 but most 8V92 Newells have a 180 degree thermostat in them). If temperatures get above 200 back out of the throttle and above 205 be very careful to start letting the engine cool down.