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Q:

"O" ring leak on top of engine where distributor used to be. on 2003 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Leak is not sever, but is constant.
(1) Answer
That piece has an O-ring. the O-ring is bad. A common problem. A good tech can replace that O-ring without taking the upper plenium off. Not to expensive.