When using the single-vacuum distributor, the vacuum hose runs from the vacuum port on the left side of the carburetor to the vacuum canister on the distributor. In that case, the vacuum port on the rear of the carburetor must be plugged.
For most cool season grasses and for folks living in northern climates, the best time to plant grass is in late August, early September. Depending on exactly the climate you have and the type of grass seed you're planting.
Planting Grass Seed in Michigan. Because Michigan is located in the northern region of the United States, most of your cool season grasses will grow well in lawns and most notably Kentucky bluegrass and fine fescue for your lawns and sport fields, and bent grass for your high maintenance landscapes and golf courses.