How to Rebuild the Big-Block ChevroletThe photos in this edition are black and white. The Mark IV Chevrolet big block, made from 1965 to 1976, produced legendary performance and is one of the greatest big blocks of all time. This design was a giant performance leap ahead of the old Chevy wedge big block. The Mark IV featured canted valves, large intake ports, and an efficient head design for vastly increased air fuel flow, better combustion, and huge horsepower. With a big block under the