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 Pennsylvania. Plant grass seed in Pennsylvania between the dates of August 15 and October 1. Seeding in late summer or early fall provides warm soils, cool temperatures and autumn rains, creating a good environment for seed germination. Grass can be established in the spring and early summer, but you will contend with weed overgrowth.