Sources suggest that the 366 Chevy Big Block has a large capacity 8 quart oil pan on it. You may try at 7 quarts and see where it is on the stick, add as needed.
General Motors Company introduced the 366 gasoline engine beginning in the 1960s and continued production until the mid-1990s. The GMC 366, which is considered a tall deck motor because of the elevated shape and design, has a small bore and long stroke, making it a powerful workhorse that doesn't produce particularly high rpm.
The engine produces 366 horsepower at 5,500 rpm and 380 ft-lbs of torque at 4,300 rpm. No turbocharger or supercharger was offered with this type of engine.
A truck is like most things in life: You get out what you put in. And for those who depend on their vehicle day-in and day-out to deliver results, a bit of care and maintenance goes a long way.
Check out these simple steps to take to help extend the life of your beloved truck from Roadandtrack.com.