I have a 1987 Formula with the 305 LG4 (carb). I went to the local Pontiac dealer to get replacement heater hoses and radiator hoses. I was told the AC hoses are no longer available. I can pretty much get after market hoses at Autozone, rockauto, etc. I am having trouble with one hose. The one heater hose is 3/4" and it runs from the water pump to the heater core. It has a T in it and a smaller hose that runs to a nipple on the back of the manifold. This hose is 1/2" at the T connection then it curves toward the firewall and then bends down to the manifold. At the manifold it is 3/8". I have not been able to locate the hose. Worst case scenario is I cannot get the hose or fab one, can I just plug that hole on the manifold without causing any problems? The car is only used for car shows, no more than 1,000 miles per year.

Thanks for any help.

 

It wont cause any problems. just plug the holes off on the intake and firewall