I put copper gaskets on just the drivers side today and they leak. I have hooker LTs and am pretty mechanically inclined but i am kind of stumped. Do they have to get hot and then be retightened? It was only like 30 degrees today. The car only ran for maybe a minute after i did it and they were still leaking when i shut it off. I have the bolts tight but i did it with a stubby wrench so maybe not tight enough?????? Any ideas or should i put ultra seals back on?

 

My coppers leaked too, but just a little. I went with Mr. Gasket Ultraseals from Autozone, and they work great. They are very similar to the popular Felpro's.

Dan

 

yeah thats what what was on it and they were fine i am going to run the engine for a few min to get the headers hot but not the heads and try to "seat the gaskets better, otherwise they are coming off

 

Just save time and switch to Felpro or Mr. Gasket. I blew 4 sets of Hookers before I came to my senses. Got Felpro 1406 put on today and it is in great shape! Just wish I could say the same for the rest of the car.....SES....

 

Would the stock GM gaskets work on your headers? I have read here (at least for Mac headers), that the stock GM steel gaskets work. Thats what i have used and as far as i know, no problems--Transamdude95, if your SES light might be related to your headers, check your EGR/header hookup, i had a SES light for almost a year after install and by dumb luck playing around i put a ugly wad of copper rtv sealant around where the egr tube and header hookup, light went out later. Dwayne

 

I put on my copper gaskets and i had a leak too. I checked it out and it was my slip fit primary. It's not a big leak and can barely be heard, but i like knowing that a copper gasket will NEVER blow apart like a paper one. Those bolts were a PITA.

 

same problem here.... coppers suck!