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.
Warm-season grasses are slow to green up in the spring, grow best in the summer and go dormant after the first heavy frost. Warm-season grasses grown in Arkansas include bermudagrass (Cynodon spp.), centipedegrass (Eremochloa ophiuroides), St. Augustinegrass (Stenotaphrum secundatum) and zoysiagrass (Zoysia spp.).