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jor
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Found the Leak in the 390
Re: the mysterious Edelbrok head leak
Aha!!! I got home from work today and checked out my son's engine. He had taken off the header today and had left for work. I poured some water in the radiator and heard the now unfortunately splash of water trickling to the garage floor. With the header off I could plainly see the source. It is a threaded hole in the Edelbrok head which had been covered by the header. What the heck is this deal?!? Water just pours right out of it. It must thread right through #7's water jacket! How do we fix it? I'm thinking a right sized bolt with an allen head or something. What do you think? Here are the photos I just took.
jor
http://jor.photosite.com/Leaking/?page=1
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6/17/2004, 6:21 pm
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6772FordFseries
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Re: Found the Leak in the 390
Ah-ha! I can see from your pics that you have the 72cc heads, which have both vertical and diagonal header bolt patterns. (The 76cc heads have a vertical bolt pattern only.)
I can't remember the specifics right now, but certain other Ford models (I believe it's the Mustang and/or Fairlane) had a different exhaust manifold bolt pattern vs. the other models. Some used the vertical pattern, others used the diagonal pattern. Your headers use the vertical pattern, so the other set of bolt holes aren't being used for your application. Apparently one of these bolt holes goes into a water jacket and simply needs plugged, as you suggested. A small Allen-head plug, properly sealed, should fix your problem. In fact, something like this should have been covered in the documentation you received with the heads, and I'd be surprised if the plug itself wasn't also included with the package.
Don't you love it when a problem turns out to be something so minor? 
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Keith
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6/17/2004, 7:40 pm
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DuckRyder
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Re: Found the Leak in the 390
Yep, plug them all that you aren't using to be on the safe side.
Allen head plug with PST on it should do the trick.
Do those Hookers seal against the exhaust port?
Last edited by DuckRyder, 6/17/2004, 8:20 pm
--- Robert
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6/17/2004, 8:19 pm
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jor
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Re: Found the Leak in the 390
Yea, I felt pretty good knowing that we wouldn't have to tear it down again. Re the headers sealing properly, can't say yet. The old setup was with the stock heads and we haven't fired this one up yet. I'll have to ask Patrick about the documentation but it just seems stupid to me to bore into the water jacket for any reason but what do I know??? Anyhow, I guess we'll try and find some kind of plug that will fit and seal it well as you suggest. Maybe we'll have this baby on the road yet! Thanks, guys.
jor
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6/17/2004, 10:20 pm
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DuckRyder
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Re: Found the Leak in the 390
It might be hard to find a plug. I do not think you want o use a NPT plug.
What I would probably do (and will probably do to mine while off) is drill the remaining holes in the header and use the extra bolts.
PST (Pipe Sealeant with Teflon) by permatex/loctite.
I agree about the drilling into the water jacket. I'm honestly not sure its by design. It might be wort a call to E-Brock tech to see if you need an exchange head.
Watch what gaskets you use on those headers, makes sure the port in the gasket is small enough to seal the sealing ring. Both Fel Pro and Mr Gasket miss the top of the port.
(From experiance.)
--- Robert
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6/18/2004, 5:17 am
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willowbilly3
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Re: Found the Leak in the 390
What you will need is an allen head set screw.
Small block mopars have exhast manifold bolts that go into the water jackets so it isn't real unusual but I have never seen a ford do it.
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Buy The Ticket, Take The Ride
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6/18/2004, 10:59 pm
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DuckRyder
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Re: Found the Leak in the 390
yes,
An allen head set screw will work well if you can locate them in the proper size. (they are surprisingly hard to find around here.)
My other concern would be removing them should the need ever arise.
Let us know what you end up doing.
--- Robert
1972 Ford F100 RangerXLT
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6/19/2004, 7:41 pm
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jor
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Re: Found the Leak in the 390
I stopped by Ace Hardware yesterday to take a look at their bolt selection. It is surprisingly good. They have many sizes of allen head set screws, special grade 8 chrome fasteners and so on. I'll post if they have the right size.
jor
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6/20/2004, 9:12 am
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TheImpaler
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Re: Found the Leak in the 390
Alrighty - I haven't really been keeping you guys up to date...Not even sure if I should have been. Anyway, I picked up a set screw and lathered it in some high quality sealer - I am going to let it cure for 24 hours and see if I can get this beast going.
-Patrick
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6/21/2004, 1:05 am
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DuckRyder
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Re: Found the Leak in the 390
Do we have it hitting a cam lick yet?
Common we are all trying to live vicariously through you.
I tried living vicariously through he club cobra people, but when they start posting $6500.00 MACHINE SHOP bills, I just get depressed.
:)
--- Robert
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6/21/2004, 6:46 pm
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