Chapman (pictured left) was one of three runners to clock under four hours for the undulating course.
He finished in three hours, 51 minutes and 40 seconds, which was less than two minutes ahead of Cornwall AC’S over-45 veteran Adrian Bell, who came second in 3:53.19.
Springfield Striders’ Gavin Allen came third in 3:55.10, with Milton Keynes runner Gary Blaber fourth (4:00.10), South Molton’s Steve Bell fifth (4:02.52) and Plymouth Harriers’ veteran David Beckenkrager sixth (4:06.25).
More than 240 runners from around the country entered the race, which started and finished at Princetown, with 194 surviving the course and the three strict cut off deadlines.
The race took athletes from Princetown through Dartmeet, Poundsgate, Newbridge, Ashburton, Buckland-in-the-Moor, Widecombe-in-the-Moor and Postbridge before heading back to the start.
Teignbridge Trotters’ Helen Anthony was first women home and ninth overall in 4:18.29.
Mud Crew’s over-50 veteran Diane Roy was second in 4:31.31 and Bere Alston’s Samatha Lake was third women home in 4:36.23.
Neither the male or female record was broken.
Mud Crew won both team events. They were followed home in the men’s team category by Okehampton, Cornwall AC, Tamar Trotters and Erme Valley.
Behind them in the women’s team awards were Teignbridge Trotters, Crediton, Plymouth Musketeers and Tamar Trotters.