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View Full Version : Blown headgasket. But what the heck is this!?!?! Pics


Barrymaxx
10-24-2007, 04:40 PM
I started noticeing a noise coming from my engien under hard acceleration when it isnt totally warmed up. After some inspection, i found that I had a bad(blown) headgasket.

So today I start to pull it apart. After I take the gasket out, I see these "bubbles" in it where the gasket covers over the cylinder bolts.

Im sure they werent there when i put the thing in. Anyone know whats going on here?

Hopefuly you can see what im talking about in the pic.
Barrymaxx
10-24-2007, 04:44 PM
It looks larger in real life, but you get the point. It actually was touching the head of the clyinder bolt.

Heres another pic of how blown it was.

What headgasket should I replace it with? This was a cheap one, and im not doing that again...:devil:
Ruby Soho
10-24-2007, 04:44 PM
either the cometic MLS or the factory one
f150mann
10-24-2007, 05:05 PM
mls for sure
Barrymaxx
10-24-2007, 06:39 PM
Alrite. Ill probly go cometic.

Any ideas on that strange bubble?
f150mann
10-24-2007, 07:29 PM
i dont see what u mean
Barrymaxx
10-25-2007, 06:59 AM
That yellow/orange ish lump in the first pic. Its like the gasket got sucked into the cylinder bolt cavity...
f150mann
10-25-2007, 07:41 AM
any chance the gasket was just too small of a hole around that stud, and when you tightened the stud it pushed the excess into the hole with it
CDCHONDAS
10-25-2007, 01:36 PM
that bubble is above the cylinder mounting bolts, probably corrosion or heat made it do that, no i havent seen one do that and all I use on 400ex's are cometic laminated gaskets straight from cometic.
drew416ex
10-25-2007, 08:16 PM
Did you torque the head when you reinstalled it? The last time I saw a blown head gasket on a 400 was because the head was over tightened and it stripped out the threads in the jug.
Big - D Racing
10-26-2007, 01:31 AM
the stock steel gasket is the only gasket I will ever run. Lenny Duncan of Duncan racing is my engine builder and he wouldn't touch another gasket with a 10 foot pole. He swears nothing is as good as the oem. He uses oem even for the 440's by having it machined to 89.00 mm, which I run and have never blown a single head gasket running 12:1 compression