i have a question. if my header flange is slightly warped, will the aluminum one bend to the shape and make a leakless seal? i'm not sure if they're actually warped or not, i'm asking b/c i had paper gaskets on my headers and they were fine until they blew, then i bought mr. gaskets copper seal gaskets. but the copper ones leak. if i got percy's or earl's aluminum gaskets would it be leakless? thanks in advance.

 

I have had Percys on my car for two years
Get this, I have re used them three times and STILL no leaks...well spent money if you ask me.

 

If they are warped you would need a compessible gasket to seal, not a metal one. But you would be better off removing them and checking to see if the are actually warped, and if they are, getting the flange resurfaced.

 

how can i tell if it's warped? would i be able to just look at it and tell. b/c if that's the case it doesn't look like it's bent or wapred or anything. maybe the copper gasket just isn't thick enough, right now i'm using 1 inch bolts on the header with a locking washer on each one. if the aluminum gasket is thicker then i shouldn't have a leaking problem. but i'm not too sure.

 

i used the flowtech same as a perceys they are nice only draw back is on a ported head they will cover some of the port this hurts performance i went to a felpro 1406 held up fine with forced induction

 

I'm a little confused. So with the Percy's do you get D-ports or the square ports on the stock heads? Then if you get them ported which do you use?

 

you get the d-ports on stock heads.

 

I ended up gettings some Percy's gaskets. Very nice!
I'll start the car before the weekend and let you know how they perform.

 

Okay thanks.

 

If you have them off the car, lay the flange on a piece of glass. If any part of the flange is not touching the glass they are not flat. You can check it with a feeler guage.