383 intake gasket question

[troy.70R/T]

I am getting ready to change out the intake on on my 383. I see that some intake/valley pan gasket kits offer intake gaskets  and valley pan together. Do I need both? all the intakes I have ever taken off only have a valley pan under them. what is the (extra) Gasket for? Also what is the insulation that I sometimes find between the intake and valley pan called? DO I need it? what is is called if I want to buy it? Thanks for any help. Its a beautiful summer day in Missouri to be working on a Mopar.

[John_Kunkel]

Some folks don't trust the original embossed steel gasket to seal with aluminum manifolds so they use both the original and composite gaskets. Not really necessary.

The foil-covered pad under the intake is a "silencer", intended to dampen the resonance of the tappet chamber. Repops are available but only the "keep it original" fanatics seem to use them.

[A383Wing]

unless you have had the intake or heads milled, the gaskets will not allow the intake to be bolted down correctly...leave them off..just use the metal valley pan

[cudaken]

 Never have used the extra gasket, don't think I ever will after 41 years now!

[justcruisin]

On iron heads and manifold I have only ever used the pan and some RTV. With the eddy heads and RPM manifold I did use gaskets as well as the pan, mainly to take up a gap. The 0.030" gaskets that came with the pan were to thick and I had to made my own out of thinner gasket paper.

[troy.70R/T]

Thanks for the info guys.  I think I will just use the valley pan and forget the insulation on this minor budget build. 

[Cooter]

Make sure to use silicone sealer on the ends where head, block, and intake meet, as well as on the threads of the bolts and on both sides around the intake ports. (Keeps oil leaks at a minimum).

[troy.70R/T]

I was wondering if I should use thread sealant on the intake bolts like I have used on the exhaust manifold studs. Or is the silicone gasket maker a better idea?

[Cooter]

Just long as it's sealed. You can use same type you used.

[firefighter3931]

I was wondering if I should use thread sealant on the intake bolts like I have used on the exhaust manifold studs. Or is the silicone gasket maker a better idea?

I have allways used the Permatex Ultra Copper high temp RTV on engine gaskets. Let it set up overnight and do the final torque down AFTER the rtv cures. 


Ron

[ACUDANUT]

X2

[troy.70R/T]

Do you all use that on the threads or nothing or thread sealant on the bolt threads.

[ACUDANUT]

You only need it on the intake gasket (all the way around) IMO
Exhaust threads are another story.

[troy.70R/T]

Ok thanks. I should actually be able to start putting things together this weekend.