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Old 04-05-2017, 09:16 AM   #1
SuperDave
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Default 39 Head torque

Edmund (sp?) finned aluminum, 40? 45 ? "Best" brand gasket. Copper coat ?
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Old 04-05-2017, 01:07 PM   #2
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Default Re: 39 Head torque

45 lb, Best gaskets are fine. No copper coat.
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Old 04-05-2017, 03:02 PM   #3
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Default Re: 39 Head torque

Yes, #45 is more than enough. However, you should do this through at least 3 heat cycles. THis will insure compressing the gasket. Now if these are new heads they should be checked for piston clearance. Looking foe .045/050" for best preformance and economy.
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Old 04-05-2017, 08:28 PM   #4
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Default Re: 39 Head torque

motors manual says 35 to 40# for aluminum, I don't like copper gaskets with aluminum heads, worry about electrolisis, it my never happen but I play it safe
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Old 04-06-2017, 02:02 PM   #5
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Default Re: 39 Head torque

I just noticed that there are two different head gaskets for this engine. one type has round water passage holes in the center, the other has trapezoidal holes.. Does it make a difference?
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Old 04-06-2017, 02:22 PM   #6
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Default Re: 39 Head torque

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Quote:
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I just noticed that there are two different head gaskets for this engine. one type has round water passage holes in the center, the other has trapezoidal holes.. Does it make a difference?
I'd suggest you match the gasket to the engine (hole). The trapezoid hole is Ford, the round hole is Merc.
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Old 04-06-2017, 02:50 PM   #7
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Default Re: 39 Head torque

Kube ? I wasn't aware of a Ford vs Mercury block, an additional detail?
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Old 04-06-2017, 04:50 PM   #8
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Default Re: 39 Head torque

What holes are in the head? I have always used the gasket with round holes. I believe Ford went to these as a service gasket.
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Old 04-06-2017, 05:19 PM   #9
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Default Re: 39 Head torque

The head is in the machine shop, so I can't match it up to the gasket yet. The gasket that matches the block has the trapezoidal water holes in the center and has larger water holes in the lower section. I'll take some pictures when I have all the parts here.
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Old 04-06-2017, 05:58 PM   #10
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Default Re: 39 Head torque

A friend of mine always put a good coat of silver aluminum pigment spray paint on copper gaskets instead of copper coat. His explanation way back then was that it wouldn't corrode as easy. Knowing what I know now about dissimilar metal corrosion, it makes even more sense to me now. The aluminum pigment paint would block the copper from the aluminum head better as well as provide a bit of sealing.

Best gaskets are pretty good stuff but sometimes you have to play with the gasket thickness and copper is the only way to really do that. It just depends on how you build the engine.

Ford played around a fair bit with the deck ports. 221 24-stud would have trapezoidal center ports. 239 engines were round in the center. A lot of gaskets choke down on some of the ports to slow the flow in certain areas. They just have small holes in the gasket while the deck ports will be larger.
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Old 04-06-2017, 06:29 PM   #11
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Default Re: 39 Head torque

Quote:
Originally Posted by JSeery View Post
Kube ? I wasn't aware of a Ford vs Mercury block, an additional detail?
At least in '39 - '40, the center water passage was different between the Ford and Mercury castings. Ford had a trapezoid shaped passage while Mercury had a round passage.
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Old 04-06-2017, 09:55 PM   #12
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Default Re: 39 Head torque

Quote:
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At least in '39 - '40, the center water passage was different between the Ford and Mercury castings. Ford had a trapezoid shaped passage while Mercury had a round passage.
Thanks, didn't know that! But then there's lots I don't know!!!
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Old 04-07-2017, 08:23 AM   #13
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Default Re: 39 Head torque

This is from Best for copper or graphtite gaskets.

Install using using a spray-on sealant like K & W Copper Coat or Permatex Copper Spray-A-Gasket. Always re-torque, no short-cuts.

John
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Old 04-07-2017, 10:45 AM   #14
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Default Re: 39 Head torque

If I did it right, there should be two head gaskets pictured.
Attached Images
File Type: jpg head gaskets.JPG (153.9 KB, 48 views)
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Old 04-07-2017, 10:48 AM   #15
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Default Re: 39 Head torque

It worked ! The top one is the one I removed. The bottom one is the new one I am going to install. The top one not only restricts water flow in the center, but also has smaller water holes on the bottom between 1&2 and 3&4. This is a much better match to the block. Machine shop is dragging it's feet.
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Old 04-07-2017, 12:47 PM   #16
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Default Re: 39 Head torque

Ford actually restricted some of the ports for a reason. This way they could control the flow around the cylinders and especially through the head a bit better to relieve hot spots. The 8BA blocks had larger ports at the back of the decks to flow more from rear to front but it made the decks a bit weaker. I don't get real worried about the gaskets changing the coolant flow.
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Old 04-07-2017, 05:35 PM   #17
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Default Re: 39 Head torque

The upper gasket directs more flow to rear cylinders and is a much better gasket than the lower one. The upper still allows plenty of flow at the middle.
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Old 04-08-2017, 04:28 PM   #18
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Default Re: 39 Head torque

Bad news... Got the head back from the 'shene shop.. They cut it .012. I didn't like what I saw. The head was bowed with the center raised. Making the end chambers slightly smaller.Couldn't find my magnetic mount for my dial indicator. (probably loaned out!).I should have stopped but being an optimist... I put the head on without a head gasket. Cranked engine over by hand and nothing touched (that I could feel). Checked the thickness of the gasket I took off, "Best". Found the compressed gasket measured .058". I figured there should be enough clearance if the new "Best" gasket compresses the same. I would bet that the deck was cut at some time since it is a .040 over bore. It certainly had a major rebuild along the way.. Every thing was great up to the third torqueing after two runs and cooling. Third torqueing went OK but when I started it up.. knocking! Removed the head and found the front and back exhaust valve just barely touching the head. So Now it looks like we are looking for new heads. If it was my car I would opt for stock iron and dress it up with chrome nut covers but the owner likes the Bling of the finned heads. I keep telling myself that this is a fun hobby.. It sure as heck isn't a profitable one! Anyone have a set of uncut finned heads?
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Old 04-08-2017, 04:47 PM   #19
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Default Re: 39 Head torque

Why not just clearance for the valves? Not that difficult.
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Old 04-08-2017, 05:55 PM   #20
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Default Re: 39 Head torque

Yup, X2 do that all the time. However, I usually measure the clearance before I bolt them on.
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