Head Gasket Trouble - Pull Engine

stang89bidges · Feb 22, 2016

I'm running MAC shorties, what you got?

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Gearbanger 101 · Feb 22, 2016

stang89bidges said:
I'm running MAC shorties, what you got?

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That's your issue. Mac headers are notorious for leaking. The individual flanges get all out of shape and move around with the numerous heat cycles. I finally managed to get my last ones to seal after using super thick gaskets, smeared in high temp silicone at both ends.

Never, will I pay money for Mac headers again. I've got BBK long tubes on now and they don't leak a bit.

a91what · Feb 22, 2016

stang89bidges said:
I'm running MAC shorties, what you got?

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Blue oval cheapies. Had longtubes before and they leaked as well. Now I just silly cone em'

stang89bidges · Feb 23, 2016

Yeah the MAC headers really served me well for the first 2.5 years I owned the car. No leaks. Wish I would have figured out what kind of gaskets were installed on them then from PO.

When I rebuilt the engine, I had the engine on the stand when I reinstalled the MAC headers, and they were bent. I had to pry #4 pipe to get the bolt to finally thread in. So they definitely are under stress. They are a real pain in the A$$ to mess with in the car. Like when I replaced the gaskets last weekend... I would love to get new headers.

When you guys use silicone, does it fix the leaks for good? I hate to use silicone....

stykthyn · Feb 23, 2016

Only gaskets I've used that had ZERO leaks were the copper ones.

stang89bidges · Feb 23, 2016

FWIW... I hope I have luck like these guys all seem to with the Percy's.

http://www.stangnet.com/mustang-forums/threads/copper-header-gaskets.790162/

7991LXnSHO · Feb 23, 2016

Those steel core/graphite Felpro gaskets are not cheap gaskets. They might not have been right for your application (designed for logs vs. headers). I also hear great things about soft copper gaskets for headers.

Burn out like that can be from when a header bolt gets loose or a warped flange. If the thick aluminum blows out, check to see how flat your flanges are and think about some Stage 8 fasteners or some type of locking or wiring method.

stang89bidges · Feb 23, 2016

I have ARP bolts in crap mac headers. Prob the headers. If these new ones burn out in buying new headers.

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TOOLOW91 · Feb 24, 2016

stang89bidges said:
I have ARP bolts in crap mac headers. Prob the headers. If these new ones burn out in buying new headers.

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I have parts store spectre header bolts with mr gasket ultra seal header gaskets. No leaks no bolts coming loose . I use a dab of rtv on all my header bolts as thread locker . Seems to work well

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stang89bidges · Feb 24, 2016

Which ones?

5930
5929
5928
7161

http://m.summitracing.com/search/pr...0l-302/engine-family/ford-small-b-windsor

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stang89bidges · Feb 24, 2016

Oh wait, your running a 351 block aren't you...

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A5literMan · Feb 24, 2016

stang89bidges said:
Oh wait, your running a 351 block aren't you...

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No it's a Dart 8.2" block.
I used the Percy's on my shorties with locking nuts. Was going to use the copper ones for the BBK LT's but never got to install them.

TOOLOW91 · Feb 24, 2016

I want to say 5930 . Autozone has Always had them on the shelf .

And I'm 8.2 302 based dart block

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stang89bidges · Feb 24, 2016

I just saw this too, do you have Dart heads? Or Dart Style heads?

5929=Dart port style and size

5930=Stock port style and size

stang89bidges · Feb 24, 2016

Pricing difference...

5930
SR = $21.97
AZ = $16.99

5929
SR = $28.53
AZ = $29.99

stang89bidges · Feb 24, 2016

Well I keep researching and I keep finding things I should have known already... I started thinking about modifying my header gasket ports because they were too small. So I looked up my heads and they recommend the following gasket =

http://www.summitracing.com/parts/fpp-1487

The port size for the felpro 1487's are different than both of the mr gaskets.

TOOLOW91 · Feb 24, 2016

No I have stock style twisted wedge heads

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jAEded · Feb 24, 2016

I used the Earl's Pressure Master gaskets. No leaks so far and they've been on a few years. But, I also bought shorty headers that have a one piece flange instead of individual flanges for each exhaust port.

mikestang63 · Feb 24, 2016

Felpro 1415's,- old school trick I've done for decades is soak them in water overnight and use allen head SS bolts with lock washers. Haven't had a leak in many cars and no need to retorque the bolts.

7991LXnSHO · Feb 25, 2016

So what does the water do to those gaskets? Without a catalog, I could use help remembering their composition.

Head Gasket Trouble - Pull Engine

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Straight Outta Locash

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I want to measure mine. It doesn't look that tall.

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wanna catch the space herp

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At least it is lumpy...

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wanna catch the space herp

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