The Big Red close the season at 5-5, 4-3 in the league.
Plymouth had back-to-back non-losing seasons for the first time since 1993 and 1994.
The hosts jumped out to an 8-0 lead at the 3:22 mark of the opening period.
Plymouth led 28-0 at one point.
Hunter Bailey added 92 yards on eight tries.
Read more in Saturday's Norwalk Reflector and Sandusky Register.