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.
Lawn Seeding Service. Early fall is the best time to seed grass throughout the northern part of the United States. SavaLawn, a leading provider of professional lawn care services, advises homeowners and property managers to take advantage of this opportunity to introduce new seed varieties to their lawn.