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#55745 01/30/2006 11:25 AM
Joined: Aug 2004
Posts: 399
S
Shop Shark
Shop Shark
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Joined: Aug 2004
Posts: 399
I recived 2 261 head gaskets from Tom Langdon today.
To my surprise they are different.

One is what I expected, the other one is asymetric.

What I mean is: If you look at it from top and have cyl. #1 an the left.

Below the 6 cylinder cutouts/holes are the 7 water holes. This is the pattern:

#1 0.77 in
#2 0.77 in
#3 1.23 in
#4 0.77 in
#5 1.23 in
#6 0.77 in
#7 0.77 in

On the second gasket I have is this:

#1 0.25 in
#2 no hole eek
#3 0.25 in
#4 no hole eek
#5 1.23 in
#6 0.77 in
#7 0.77 in

have you ever seen such a gasket?
Can I use it on my 261? Any reasons for the different patterns?

Thanks, Frank

Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269
Frank,

Please let me know if you want a full-lemgth photo of a 261 head gasket posted. Any chance you can post a photo of your 2nd gasket?

Here is a photo of a NOS 261 head gasket. Unfortunately, this photo just shows part of a gasket, enough to cover one-pair of the "siamesed" cylinders on a 261.

This cut-away photo of a 261 block from the 1954 Chevrolet Truck Engineering Features book will give you a little idea of the cooling holes/passages in the block (if you do not now have the head off the block).

Tim

Joined: Aug 2004
Posts: 399
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Shop Shark
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Posts: 399
Here is a Photo of the two gaskets

Click on it to enlarge

[img]http://img93.imageshack.us/img93/2875/gasket0oh.th.jpg[/img]

Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269
Frank,

You might want to send that photo to Tom Langdon. He will most likely make things right without much hassle. I will not be able to look at my gasket until tonight but it looks like the top gasket is defective.

Landon\'s Stovebolt Engine Parts Co.: [email protected]

Tim

Joined: Jan 2000
Posts: 1,586
T
Extreme Gabster
Extreme Gabster
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Joined: Jan 2000
Posts: 1,586
I've noticed that GM 261 head gaskets have different cooling holes than a Felpro gasket.I've used both styles,never noticed any cooling problems.
Langdon may have sent you one of each,pick the one you like.He'll probably have some engineer double talk to explain the difference,and then go off on water heated intakes.

Joined: Jan 2001
Posts: 5,337
P
'Bolter
'Bolter
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Joined: Jan 2001
Posts: 5,337
I have 3 NOS 261 head gaskets all with different part numbers and the water holes are different on each, so GM did experment with the gaskets.


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