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Unread 09-22-2013   #1 (permalink)
custom600rr is offline Apprentice


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Default Mustang 5.0 Header Gaskets

I'm sure this has been asked before. What is the best header gasket to use? I've read the old posts and they say Percy's in 2007. Just wondering if currently there is a better one or if that's still the one to get. Also does anyone know the percy's part number for 93 cobra heads? They have 2 versions. I'll buy the best so I don't have another blow out. All the bolts on head and collector are tight and I'm almost positive it's the gasket. Resorting to driving my Chevy truck until it's resolved. Bummed because the mustang is my daily driver.
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Unread 09-22-2013   #2 (permalink)
cindys_sn95 is offline Banned


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PLANE OLD MR. GASKET PAPER GASKETS! the key is to re-torque 1 or 2 times after a couple of heat cycles. I have never had a header gasket leak.
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Unread 09-22-2013   #3 (permalink)
Smurf stang is offline SHELBY GT 500 Member

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Felpros are also fine. Like Marky said retorque and sometimes you gotta check them and retorque is necessary.

If they were fine for a while and then you developed a leak then you gotta check them every once and a while.

If not then maybe the flange area is not flat.

If the bolts keep getting undone then you have these header bolt gnomes that come at night and loosen the bolts to mess with you.

Also they have locking bolts like Stage 8 bolts.
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