Intake manifold

[Aron Gleason]

After replacing the metal valley pan, I still have a vacuum leak. I ve never had this problem before, all I would do is put black silicone on the front and rear of the pan. Then bolt it down and put the intake on with nothing around the ports between intake and pan. Any suggestions?

 

[RR Fan Dan]

After replacing the metal valley pan, I still have a vacuum leak. I ve never had this problem before, all I would do is put black silicone on the front and rear of the pan. Then bolt it down and put the intake on with nothing around the ports between intake and pan. Any suggestions?

Get the gasket set. Apply proper torque sequence.

 

[WileE]

Use Indian head around the ports and use thread sealer on the bolts.

 

[Aron Gleason]

Use Indian head around the ports and use thread sealer on the bolts.

Like red thread sealer?

 

[Aron Gleason]

Use Indian head around the ports and use thread sealer on the bolts.

Do I use it on both sides of the valley pan ports?

 

[WileE]

Like red thread sealer?

NOT red loctite. Something like Permatex hi-temp thread sealer

 

[WileE]

Do I use it on both sides of the valley pan ports?

I do.

 

[Aron Gleason]

Do I leave the valley pan dry between the port opening?

 

[WileE]

Do I leave the valley pan dry between the port opening?

Just completely surround all the ports.

 

[Aron Gleason]

Do I have to let the Indian head set overnight before I start the car?

 

[Belvedere408]

I always let gasket sealer set overnight myself.

 

[1967coronet]

Also put a straight edge on the intake , if it's aluminum you may have warped one.
Also did the heads or block get cut ?

 

[Aron Gleason]

Heads and block never been cut

 

[1967coronet]

Heads and block never been cut

Is this the same intake being installed on the same engine that was leak free before?
Or has something new been tossed into the mix ?
Can you see on the pan were its leaking ?

 

[Aron Gleason]

Is this the same intake being installed on the same engine that was leak free before?
Or has something new been tossed into the mix ?
Can you see on the pan were its leaking ?

Same intake on the motor for over 25 years, and now im having problems getting it to seal. I can see where its leaking with the motor running and spraying carb cleaner.