LS7 manifold gasket

[3Dee]

YES! I don't know which is why I am asking!

Are the above able to be reused, or are they throw away.(bl@@dy expensive if that is the case)
The reason is that new ones were used (without any sealant or goo), then a few days later I had to remove to refit other stuff. Replaced the manifold, but blowing slightly - correctly torqued!

Is it a cardinal sin to use silicone? (others have said it should always be a dry fit)!

[macgtech]

We have always re-used ours and not had any issues.

[3Dee]

Do you use anything to seal it?

[Life Saab Itch]

Normal, clear, bathroom grade silicon sealer is remarkably heat resistant.

I've sealed motorcycle exhaust with it before with no ill effects. Very easy to clean the gasket surfaces up afterwards as well as the silicon just pulls away.

It will not harm the exhaust or engine if you use a sensible amount (ie a smear).

[3Dee]

So, I am right then!
Looks like most of us use silicone in the Manifold Gaskets then...despite what I was told by a certain person!

I also have heard the some use copper-grease, the rationale being the the grease burns off leaving the copper to do the job!

cheers

keith

[738 driver]

Stock DIY silicone is very corrosive though... hence why specialist assembly formulas are developed for metallic surface jointing .

IF you are talking about the exhaust header to head face gaskets that are blowing ... buy some proper exhaust assembly paste, available in mastic tubes and not expensive. Better than pulling threads next time you want to dismantle.

[Storer]

No sealant for me and no leaks/blowing


Paul