Cometic Head Gaskets $139.99

[barrok69]

They may be available VERY VERY soon. I would def use that disc code and get some savings ASAP!!!!

I did!!! And I'm waiting anxiously

[gectek]

They may be available VERY VERY soon. I would def use that disc code and get some savings ASAP!!!!

[SappySE107]

Yes, the 3400 head gaskets are interchangable with the 3.4 block (but not the DOHC block)

[ssdurango]

Should I get 3400 Gaskets for my 3.4 then? Everything should be the same, right?

[SappySE107]

.030" would be good but you can probably run .025" to 5500.

[ssdurango]

yup iron head...

[SappySE107]

Iron head?

I ask because you can run a thinner head gasket at lower RPM use.

[ssdurango]

I have the limiter set at 5500, peak HP is at 4600. I guess it could rev to 6500 but wouldn't dare. why do you ask?

[SappySE107]

iron head? What is peak RPM?

[ssdurango]

I want to purchase a set of these for my 3.4. What thickness should I order to get the ideal quench -0.025 ok? (Pistons are stock size.)

Thanks
Tom

[pocket-rocket]

Good call.

http://60degreev6.com/forum/f102/head-gasket-bore-size-vs-cylinder-bore-size-t44623#post403381

[gectek]

wait a minute. before we mess up the for sale thread....start another one
better idea

[gectek]

maybe im not understanding what you mean entirely.

dumb it up for me please.

[pocket-rocket]

Differences in thermal expansion I can see to a point, but .130 vs .020? I'm not trying to be a smart alec here, just trying to understand why difference in the stock gasket bore vs the cylinder bore is so large a little better. Maybe I should hit up Brad to ask his source at GM powertrain to get a more technical point of view.

[gectek]

all sorts of problems such as the pistons/bore getting larger and the fire ring staying the same, as well as higher rpm with rod stretch and heat taking over. also the shear effect between the head and the block due to differences in thermal expansion. those are just a few.