I'm ordering the percy gaskets right now. I am using the as&m midlength headers. What size gasket am i gonna need for the collector? 2 1/2, 3, or 3 1/2 inch gaskets?

 

3 inch

 

are you sure because i called as&m and asked them what the size of the collectors were and the guy said 2 1/2. I asked him if i would use 2 1/2 gaskets and he said yeah. I hope its not 3 cuz i ordered the gaskets already.

 

it is 2.5". THEY ARE NOT 3 INCH!!! I have the headers AND the percy gaskets, I should know. 3" is the size of the ypipe when it goes single. Each HEADER has a 2.5" collector. I'm 140% sure, who wants to bet against me. i'll wager my car,

Oh, and those are very good gaskets, they haven't blown on me yet. I had a problem with the passanger side collector hitting the frame under hard acceleration and causing the flange to leak, but I got new gaskets and installed solid motor mounts, no problems now. Good luck.

 

Thanks for the info Hawk. I have another question for you. With the percy gaskets am i supposed to use gasket sealer or whatever that stuff is on the gaskets?

 

No, they are deadsoft aluminum. Just install them by themselves, they will conform to the flange.


Brian

 

which direction did you guys install the Percy's? smooth side towards the head or the manifold/header? I have a set to throw in this weekend and am wondering....