For the weight of motor oil to run, use 10w-30, not straight 30 weight. The straight weight oil will cause problems with lubrication when the motor is cold, especially in the winter months, causing oil starvation. The clearances on these motors are much tighter than the falcons and other american iron you have worked on in the past, so the 10w-30 is essential for proper lubrication. Don't want to see you damage the motor after all you have been through to fix it.