We have used this molded 3/4" x 5/8" 90 Degree Heater Hose many times when plumbing into a modern LS or LT engine. The stock GM LS & LT engines have pressed-in barbs in the water pumps. The smaller 5/8" barb is the pressure port and the larger 3/4" barb is the return port. Both of these barbs point directly toward the passenger side front wheel. This molded 90 degree hose works great to quickly turn the corner off of the water pump and route the hose back toward the firewall. Use this hose for the return line in conjunction with #099003 on the 5/8"" pressure barb. The long leg of this molded hose is sized at 5/8" and is approximately 38" long. The short leg is also sized at 3/4" and is approximately 4" long.