I am going to take my smog equipment off the car and want to know what I should use to block the holes in the stock exaust manifolds.

 

I think the size is 1/4 on the plugs. Go to your hardware store and pick you up some.

Later

 

Hose goes to a check valve and then to the individual outlet pipes. I take the check valve off and block it off with a pipe cap from a hardware store.

Also, you might have to find somethign to block up the pipe that goes to the cat.